@@ -496,19 +496,26 @@ void ff_cbs_trace_header(CodedBitstreamContext *ctx,
av_log(ctx->log_ctx, ctx->trace_level, "%s\n", name);
}
-void ff_cbs_trace_syntax_element(CodedBitstreamContext *ctx, int position,
- const char *str, const int *subscripts,
- const char *bits, int64_t value)
+void ff_cbs_trace_read_log(CodedBitstreamContext *ctx,
+ GetBitContext *gbc, int length,
+ const char *str, const int *subscripts,
+ int64_t value)
{
char name[256];
+ char bits[256];
size_t name_len, bits_len;
int pad, subs, i, j, k, n;
-
- if (!ctx->trace_enable)
- return;
+ int position;
av_assert0(value >= INT_MIN && value <= UINT32_MAX);
+ position = get_bits_count(gbc);
+
+ av_assert0(length < 256);
+ for (i = 0; i < length; i++)
+ bits[i] = get_bits1(gbc) ? '1' : '0';
+ bits[length] = 0;
+
subs = subscripts ? subscripts[0] : 0;
n = 0;
for (i = j = 0; str[i];) {
@@ -535,7 +542,7 @@ void ff_cbs_trace_syntax_element(CodedBitstreamContext *ctx, int position,
av_assert0(n == subs);
name_len = strlen(name);
- bits_len = strlen(bits);
+ bits_len = length;
if (name_len + bits_len > 60)
pad = bits_len + 2;
@@ -546,6 +553,34 @@ void ff_cbs_trace_syntax_element(CodedBitstreamContext *ctx, int position,
position, name, pad, bits, value);
}
+void ff_cbs_trace_write_log(CodedBitstreamContext *ctx,
+ PutBitContext *pbc, int length,
+ const char *str, const int *subscripts,
+ int64_t value)
+{
+ // Ensure that the syntax element is written to the output buffer,
+ // make a GetBitContext pointed at the start position, then call the
+ // read log function which can read the bits back to log them.
+
+ GetBitContext gbc;
+ int position;
+
+ if (length > 0) {
+ PutBitContext flush;
+ flush = *pbc;
+ flush_put_bits(&flush);
+ }
+
+ position = put_bits_count(pbc);
+ av_assert0(position >= length);
+
+ init_get_bits(&gbc, pbc->buf, position);
+
+ skip_bits_long(&gbc, position - length);
+
+ ff_cbs_trace_read_log(ctx, &gbc, length, str, subscripts, value);
+}
+
static av_always_inline int cbs_read_unsigned(CodedBitstreamContext *ctx,
GetBitContext *gbc,
int width, const char *name,
@@ -555,7 +590,8 @@ static av_always_inline int cbs_read_unsigned(CodedBitstreamContext *ctx,
uint32_t range_max)
{
uint32_t value;
- int position;
+
+ CBS_TRACE_READ_START();
av_assert0(width > 0 && width <= 32);
@@ -565,21 +601,9 @@ static av_always_inline int cbs_read_unsigned(CodedBitstreamContext *ctx,
return AVERROR_INVALIDDATA;
}
- if (ctx->trace_enable)
- position = get_bits_count(gbc);
-
value = get_bits_long(gbc, width);
- if (ctx->trace_enable) {
- char bits[33];
- int i;
- for (i = 0; i < width; i++)
- bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
- bits[i] = 0;
-
- ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
- bits, value);
- }
+ CBS_TRACE_READ_END();
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
@@ -613,6 +637,8 @@ int ff_cbs_write_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
const int *subscripts, uint32_t value,
uint32_t range_min, uint32_t range_max)
{
+ CBS_TRACE_WRITE_START();
+
av_assert0(width > 0 && width <= 32);
if (value < range_min || value > range_max) {
@@ -625,22 +651,13 @@ int ff_cbs_write_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
if (put_bits_left(pbc) < width)
return AVERROR(ENOSPC);
- if (ctx->trace_enable) {
- char bits[33];
- int i;
- for (i = 0; i < width; i++)
- bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
- bits[i] = 0;
-
- ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
- name, subscripts, bits, value);
- }
-
if (width < 32)
put_bits(pbc, width, value);
else
put_bits32(pbc, value);
+ CBS_TRACE_WRITE_END();
+
return 0;
}
@@ -657,7 +674,8 @@ int ff_cbs_read_signed(CodedBitstreamContext *ctx, GetBitContext *gbc,
int32_t range_min, int32_t range_max)
{
int32_t value;
- int position;
+
+ CBS_TRACE_READ_START();
av_assert0(width > 0 && width <= 32);
@@ -667,21 +685,9 @@ int ff_cbs_read_signed(CodedBitstreamContext *ctx, GetBitContext *gbc,
return AVERROR_INVALIDDATA;
}
- if (ctx->trace_enable)
- position = get_bits_count(gbc);
-
value = get_sbits_long(gbc, width);
- if (ctx->trace_enable) {
- char bits[33];
- int i;
- for (i = 0; i < width; i++)
- bits[i] = value & (1U << (width - i - 1)) ? '1' : '0';
- bits[i] = 0;
-
- ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
- bits, value);
- }
+ CBS_TRACE_READ_END();
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
@@ -699,6 +705,8 @@ int ff_cbs_write_signed(CodedBitstreamContext *ctx, PutBitContext *pbc,
const int *subscripts, int32_t value,
int32_t range_min, int32_t range_max)
{
+ CBS_TRACE_WRITE_START();
+
av_assert0(width > 0 && width <= 32);
if (value < range_min || value > range_max) {
@@ -711,22 +719,13 @@ int ff_cbs_write_signed(CodedBitstreamContext *ctx, PutBitContext *pbc,
if (put_bits_left(pbc) < width)
return AVERROR(ENOSPC);
- if (ctx->trace_enable) {
- char bits[33];
- int i;
- for (i = 0; i < width; i++)
- bits[i] = value & (1U << (width - i - 1)) ? '1' : '0';
- bits[i] = 0;
-
- ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
- name, subscripts, bits, value);
- }
-
if (width < 32)
put_sbits(pbc, width, value);
else
put_bits32(pbc, value);
+ CBS_TRACE_WRITE_END();
+
return 0;
}
@@ -168,6 +168,51 @@ typedef struct CodedBitstreamFragment {
CodedBitstreamUnit *units;
} CodedBitstreamFragment;
+
+struct CodedBitstreamContext;
+struct GetBitContext;
+struct PutBitContext;
+
+/**
+ * Callback type for read tracing.
+ *
+ * @param ctx CBS context.
+ * @param gbc A GetBitContext set at the start of the syntax
+ * element. This is a copy, the callee does not
+ * need to preserve it.
+ * @param length Length in bits of the syntax element.
+ * @param name String name of the syntax elements.
+ * @param subscripts If the syntax element is an array, a pointer to
+ * an array of subscripts into the array.
+ * @param value Parsed value of the syntax element.
+ */
+typedef void (*CBSTraceReadCallback)(struct CodedBitstreamContext *ctx,
+ struct GetBitContext *gbc,
+ int start_position,
+ const char *name,
+ const int *subscripts,
+ int64_t value);
+
+/**
+ * Callback type for write tracing.
+ *
+ * @param ctx CBS context.
+ * @param pbc A PutBitContext set at the end of the syntax
+ * element. The user must not modify this, but may
+ * inspect it to determine state.
+ * @param length Length in bits of the syntax element.
+ * @param name String name of the syntax elements.
+ * @param subscripts If the syntax element is an array, a pointer to
+ * an array of subscripts into the array.
+ * @param value Written value of the syntax element.
+ */
+typedef void (*CBSTraceWriteCallback)(struct CodedBitstreamContext *ctx,
+ struct PutBitContext *gbc,
+ int start_position,
+ const char *name,
+ const int *subscripts,
+ int64_t value);
+
/**
* Context structure for coded bitstream operations.
*/
@@ -217,6 +262,22 @@ typedef struct CodedBitstreamContext {
*/
int trace_level;
+ /**
+ * Callback for read tracing.
+ *
+ * If tracing is enabled then this is called once for each syntax
+ * element parsed.
+ */
+ CBSTraceReadCallback trace_read_callback;
+
+ /**
+ * Callback for write tracing.
+ *
+ * If tracing is enabled then this is called once for each syntax
+ * element written.
+ */
+ CBSTraceWriteCallback trace_write_callback;
+
/**
* Write buffer. Used as intermediate buffer when writing units.
* For internal use of cbs only.
@@ -450,4 +511,23 @@ void ff_cbs_discard_units(CodedBitstreamContext *ctx,
enum AVDiscard skip,
int flags);
+
+/**
+ * Helper function for read tracing which formats the syntax element
+ * and logs the result.
+ */
+void ff_cbs_trace_read_log(CodedBitstreamContext *ctx,
+ struct GetBitContext *gbc, int length,
+ const char *str, const int *subscripts,
+ int64_t value);
+
+/**
+ * Helper function for write tracing which formats the syntax element
+ * and logs the result.
+ */
+void ff_cbs_trace_write_log(CodedBitstreamContext *ctx,
+ struct PutBitContext *pbc, int length,
+ const char *str, const int *subscripts,
+ int64_t value);
+
#endif /* AVCODEC_CBS_H */
@@ -31,10 +31,8 @@ static int cbs_av1_read_uvlc(CodedBitstreamContext *ctx, GetBitContext *gbc,
uint32_t range_min, uint32_t range_max)
{
uint32_t zeroes, bits_value, value;
- int position;
- if (ctx->trace_enable)
- position = get_bits_count(gbc);
+ CBS_TRACE_READ_START();
zeroes = 0;
while (1) {
@@ -50,6 +48,9 @@ static int cbs_av1_read_uvlc(CodedBitstreamContext *ctx, GetBitContext *gbc,
}
if (zeroes >= 32) {
+ // Note that the spec allows an arbitrarily large number of
+ // zero bits followed by a one bit in this case, but the
+ // libaom implementation does not support it.
value = MAX_UINT_BITS(32);
} else {
if (get_bits_left(gbc) < zeroes) {
@@ -62,36 +63,7 @@ static int cbs_av1_read_uvlc(CodedBitstreamContext *ctx, GetBitContext *gbc,
value = bits_value + (UINT32_C(1) << zeroes) - 1;
}
- if (ctx->trace_enable) {
- char bits[65];
- int i, j, k;
-
- if (zeroes >= 32) {
- while (zeroes > 32) {
- k = FFMIN(zeroes - 32, 32);
- for (i = 0; i < k; i++)
- bits[i] = '0';
- bits[i] = 0;
- ff_cbs_trace_syntax_element(ctx, position, name,
- NULL, bits, 0);
- zeroes -= k;
- position += k;
- }
- }
-
- for (i = 0; i < zeroes; i++)
- bits[i] = '0';
- bits[i++] = '1';
-
- if (zeroes < 32) {
- for (j = 0; j < zeroes; j++)
- bits[i++] = (bits_value >> (zeroes - j - 1) & 1) ? '1' : '0';
- }
-
- bits[i] = 0;
- ff_cbs_trace_syntax_element(ctx, position, name,
- NULL, bits, value);
- }
+ CBS_TRACE_READ_END_NO_SUBSCRIPTS();
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
@@ -109,7 +81,9 @@ static int cbs_av1_write_uvlc(CodedBitstreamContext *ctx, PutBitContext *pbc,
uint32_t range_min, uint32_t range_max)
{
uint32_t v;
- int position, zeroes;
+ int zeroes;
+
+ CBS_TRACE_WRITE_START();
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
@@ -118,28 +92,17 @@ static int cbs_av1_write_uvlc(CodedBitstreamContext *ctx, PutBitContext *pbc,
return AVERROR_INVALIDDATA;
}
- if (ctx->trace_enable)
- position = put_bits_count(pbc);
-
zeroes = av_log2(value + 1);
v = value - (1U << zeroes) + 1;
+
+ if (put_bits_left(pbc) < 2 * zeroes + 1)
+ return AVERROR(ENOSPC);
+
put_bits(pbc, zeroes, 0);
put_bits(pbc, 1, 1);
put_bits(pbc, zeroes, v);
- if (ctx->trace_enable) {
- char bits[65];
- int i, j;
- i = 0;
- for (j = 0; j < zeroes; j++)
- bits[i++] = '0';
- bits[i++] = '1';
- for (j = 0; j < zeroes; j++)
- bits[i++] = (v >> (zeroes - j - 1) & 1) ? '1' : '0';
- bits[i++] = 0;
- ff_cbs_trace_syntax_element(ctx, position, name, NULL,
- bits, value);
- }
+ CBS_TRACE_WRITE_END_NO_SUBSCRIPTS();
return 0;
}
@@ -148,20 +111,19 @@ static int cbs_av1_read_leb128(CodedBitstreamContext *ctx, GetBitContext *gbc,
const char *name, uint64_t *write_to)
{
uint64_t value;
- int position, err, i;
+ uint32_t byte;
+ int i;
- if (ctx->trace_enable)
- position = get_bits_count(gbc);
+ CBS_TRACE_READ_START();
value = 0;
for (i = 0; i < 8; i++) {
- int subscript[2] = { 1, i };
- uint32_t byte;
- err = ff_cbs_read_unsigned(ctx, gbc, 8, "leb128_byte[i]", subscript,
- &byte, 0x00, 0xff);
- if (err < 0)
- return err;
-
+ if (get_bits_left(gbc) < 8) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid leb128 at "
+ "%s: bitstream ended.\n", name);
+ return AVERROR_INVALIDDATA;
+ }
+ byte = get_bits(gbc, 8);
value |= (uint64_t)(byte & 0x7f) << (i * 7);
if (!(byte & 0x80))
break;
@@ -170,8 +132,7 @@ static int cbs_av1_read_leb128(CodedBitstreamContext *ctx, GetBitContext *gbc,
if (value > UINT32_MAX)
return AVERROR_INVALIDDATA;
- if (ctx->trace_enable)
- ff_cbs_trace_syntax_element(ctx, position, name, NULL, "", value);
+ CBS_TRACE_READ_END_NO_SUBSCRIPTS();
*write_to = value;
return 0;
@@ -180,29 +141,25 @@ static int cbs_av1_read_leb128(CodedBitstreamContext *ctx, GetBitContext *gbc,
static int cbs_av1_write_leb128(CodedBitstreamContext *ctx, PutBitContext *pbc,
const char *name, uint64_t value)
{
- int position, err, len, i;
+ int len, i;
uint8_t byte;
- len = (av_log2(value) + 7) / 7;
+ CBS_TRACE_WRITE_START();
- if (ctx->trace_enable)
- position = put_bits_count(pbc);
+ len = (av_log2(value) + 7) / 7;
for (i = 0; i < len; i++) {
- int subscript[2] = { 1, i };
+ if (put_bits_left(pbc) < 8)
+ return AVERROR(ENOSPC);
byte = value >> (7 * i) & 0x7f;
if (i < len - 1)
byte |= 0x80;
- err = ff_cbs_write_unsigned(ctx, pbc, 8, "leb128_byte[i]", subscript,
- byte, 0x00, 0xff);
- if (err < 0)
- return err;
+ put_bits(pbc, 8, byte);
}
- if (ctx->trace_enable)
- ff_cbs_trace_syntax_element(ctx, position, name, NULL, "", value);
+ CBS_TRACE_WRITE_END_NO_SUBSCRIPTS();
return 0;
}
@@ -212,12 +169,11 @@ static int cbs_av1_read_ns(CodedBitstreamContext *ctx, GetBitContext *gbc,
const int *subscripts, uint32_t *write_to)
{
uint32_t m, v, extra_bit, value;
- int position, w;
+ int w;
- av_assert0(n > 0);
+ CBS_TRACE_READ_START();
- if (ctx->trace_enable)
- position = get_bits_count(gbc);
+ av_assert0(n > 0);
w = av_log2(n) + 1;
m = (1 << w) - n;
@@ -240,18 +196,7 @@ static int cbs_av1_read_ns(CodedBitstreamContext *ctx, GetBitContext *gbc,
value = (v << 1) - m + extra_bit;
}
- if (ctx->trace_enable) {
- char bits[33];
- int i;
- for (i = 0; i < w - 1; i++)
- bits[i] = (v >> i & 1) ? '1' : '0';
- if (v >= m)
- bits[i++] = extra_bit ? '1' : '0';
- bits[i] = 0;
-
- ff_cbs_trace_syntax_element(ctx, position,
- name, subscripts, bits, value);
- }
+ CBS_TRACE_READ_END();
*write_to = value;
return 0;
@@ -262,7 +207,8 @@ static int cbs_av1_write_ns(CodedBitstreamContext *ctx, PutBitContext *pbc,
const int *subscripts, uint32_t value)
{
uint32_t w, m, v, extra_bit;
- int position;
+
+ CBS_TRACE_WRITE_START();
if (value > n) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
@@ -271,9 +217,6 @@ static int cbs_av1_write_ns(CodedBitstreamContext *ctx, PutBitContext *pbc,
return AVERROR_INVALIDDATA;
}
- if (ctx->trace_enable)
- position = put_bits_count(pbc);
-
w = av_log2(n) + 1;
m = (1 << w) - n;
@@ -290,18 +233,7 @@ static int cbs_av1_write_ns(CodedBitstreamContext *ctx, PutBitContext *pbc,
put_bits(pbc, 1, extra_bit);
}
- if (ctx->trace_enable) {
- char bits[33];
- int i;
- for (i = 0; i < w - 1; i++)
- bits[i] = (v >> i & 1) ? '1' : '0';
- if (value >= m)
- bits[i++] = extra_bit ? '1' : '0';
- bits[i] = 0;
-
- ff_cbs_trace_syntax_element(ctx, position,
- name, subscripts, bits, value);
- }
+ CBS_TRACE_WRITE_END();
return 0;
}
@@ -311,33 +243,24 @@ static int cbs_av1_read_increment(CodedBitstreamContext *ctx, GetBitContext *gbc
const char *name, uint32_t *write_to)
{
uint32_t value;
- int position, i;
- char bits[33];
- av_assert0(range_min <= range_max && range_max - range_min < sizeof(bits) - 1);
- if (ctx->trace_enable)
- position = get_bits_count(gbc);
+ CBS_TRACE_READ_START();
- for (i = 0, value = range_min; value < range_max;) {
+ av_assert0(range_min <= range_max && range_max - range_min < 32);
+
+ for (value = range_min; value < range_max;) {
if (get_bits_left(gbc) < 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid increment value at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
- if (get_bits1(gbc)) {
- bits[i++] = '1';
+ if (get_bits1(gbc))
++value;
- } else {
- bits[i++] = '0';
+ else
break;
- }
}
- if (ctx->trace_enable) {
- bits[i] = 0;
- ff_cbs_trace_syntax_element(ctx, position,
- name, NULL, bits, value);
- }
+ CBS_TRACE_READ_END_NO_SUBSCRIPTS();
*write_to = value;
return 0;
@@ -349,6 +272,8 @@ static int cbs_av1_write_increment(CodedBitstreamContext *ctx, PutBitContext *pb
{
int len;
+ CBS_TRACE_WRITE_START();
+
av_assert0(range_min <= range_max && range_max - range_min < 32);
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
@@ -364,23 +289,11 @@ static int cbs_av1_write_increment(CodedBitstreamContext *ctx, PutBitContext *pb
if (put_bits_left(pbc) < len)
return AVERROR(ENOSPC);
- if (ctx->trace_enable) {
- char bits[33];
- int i;
- for (i = 0; i < len; i++) {
- if (range_min + i == value)
- bits[i] = '0';
- else
- bits[i] = '1';
- }
- bits[i] = 0;
- ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
- name, NULL, bits, value);
- }
-
if (len > 0)
put_bits(pbc, len, (1 << len) - 1 - (value != range_max));
+ CBS_TRACE_WRITE_END_NO_SUBSCRIPTS();
+
return 0;
}
@@ -388,12 +301,10 @@ static int cbs_av1_read_subexp(CodedBitstreamContext *ctx, GetBitContext *gbc,
uint32_t range_max, const char *name,
const int *subscripts, uint32_t *write_to)
{
- uint32_t value;
- int position, err;
- uint32_t max_len, len, range_offset, range_bits;
+ uint32_t value, max_len, len, range_offset, range_bits;
+ int err;
- if (ctx->trace_enable)
- position = get_bits_count(gbc);
+ CBS_TRACE_READ_START();
av_assert0(range_max > 0);
max_len = av_log2(range_max - 1) - 3;
@@ -425,9 +336,7 @@ static int cbs_av1_read_subexp(CodedBitstreamContext *ctx, GetBitContext *gbc,
}
value += range_offset;
- if (ctx->trace_enable)
- ff_cbs_trace_syntax_element(ctx, position,
- name, subscripts, "", value);
+ CBS_TRACE_READ_END_VALUE_ONLY();
*write_to = value;
return err;
@@ -437,9 +346,11 @@ static int cbs_av1_write_subexp(CodedBitstreamContext *ctx, PutBitContext *pbc,
uint32_t range_max, const char *name,
const int *subscripts, uint32_t value)
{
- int position, err;
+ int err;
uint32_t max_len, len, range_offset, range_bits;
+ CBS_TRACE_WRITE_START();
+
if (value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRIu32", but must be in [0,%"PRIu32"].\n",
@@ -447,9 +358,6 @@ static int cbs_av1_write_subexp(CodedBitstreamContext *ctx, PutBitContext *pbc,
return AVERROR_INVALIDDATA;
}
- if (ctx->trace_enable)
- position = put_bits_count(pbc);
-
av_assert0(range_max > 0);
max_len = av_log2(range_max - 1) - 3;
@@ -489,9 +397,7 @@ static int cbs_av1_write_subexp(CodedBitstreamContext *ctx, PutBitContext *pbc,
return err;
}
- if (ctx->trace_enable)
- ff_cbs_trace_syntax_element(ctx, position,
- name, subscripts, "", value);
+ CBS_TRACE_WRITE_END_VALUE_ONLY();
return err;
}
@@ -36,41 +36,32 @@ static int cbs_read_ue_golomb(CodedBitstreamContext *ctx, GetBitContext *gbc,
uint32_t *write_to,
uint32_t range_min, uint32_t range_max)
{
- uint32_t value;
- int position, i, j;
- unsigned int k;
- char bits[65];
+ uint32_t leading_bits, value;
+ int leading_zeroes;
- position = get_bits_count(gbc);
+ CBS_TRACE_READ_START();
- for (i = 0; i < 32; i++) {
- if (get_bits_left(gbc) < i + 1) {
- av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid ue-golomb code at "
- "%s: bitstream ended.\n", name);
- return AVERROR_INVALIDDATA;
- }
- k = get_bits1(gbc);
- bits[i] = k ? '1' : '0';
- if (k)
- break;
- }
- if (i >= 32) {
+ leading_bits = show_bits_long(gbc, 32);
+ if (leading_bits == 0) {
+ // This could be the bitstream ending instead, but padding
+ // makes the read ok and we will be caught by the next check.
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid ue-golomb code at "
"%s: more than 31 zeroes.\n", name);
return AVERROR_INVALIDDATA;
}
- value = 1;
- for (j = 0; j < i; j++) {
- k = get_bits1(gbc);
- bits[i + j + 1] = k ? '1' : '0';
- value = value << 1 | k;
+
+ leading_zeroes = 31 - av_log2(leading_bits);
+ skip_bits_long(gbc, leading_zeroes);
+
+ if (get_bits_left(gbc) < leading_zeroes + 1) {
+ av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid ue-golomb code at "
+ "%s: bitstream ended.\n", name);
+ return AVERROR_INVALIDDATA;
}
- bits[i + j + 1] = 0;
- --value;
- if (ctx->trace_enable)
- ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
- bits, value);
+ value = get_bits_long(gbc, leading_zeroes + 1) - 1;
+
+ CBS_TRACE_READ_END();
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
@@ -88,45 +79,30 @@ static int cbs_read_se_golomb(CodedBitstreamContext *ctx, GetBitContext *gbc,
int32_t *write_to,
int32_t range_min, int32_t range_max)
{
+ uint32_t leading_bits, unsigned_value;
+ int leading_zeroes;
int32_t value;
- int position, i, j;
- unsigned int k;
- uint32_t v;
- char bits[65];
- position = get_bits_count(gbc);
+ CBS_TRACE_READ_START();
- for (i = 0; i < 32; i++) {
- if (get_bits_left(gbc) < i + 1) {
- av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid se-golomb code at "
- "%s: bitstream ended.\n", name);
- return AVERROR_INVALIDDATA;
- }
- k = get_bits1(gbc);
- bits[i] = k ? '1' : '0';
- if (k)
- break;
- }
- if (i >= 32) {
+ leading_bits = show_bits_long(gbc, 32);
+ if (leading_bits == 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid se-golomb code at "
"%s: more than 31 zeroes.\n", name);
return AVERROR_INVALIDDATA;
}
- v = 1;
- for (j = 0; j < i; j++) {
- k = get_bits1(gbc);
- bits[i + j + 1] = k ? '1' : '0';
- v = v << 1 | k;
- }
- bits[i + j + 1] = 0;
- if (v & 1)
- value = -(int32_t)(v / 2);
+
+ leading_zeroes = 31 - av_log2(leading_bits);
+ skip_bits_long(gbc, leading_zeroes);
+
+ unsigned_value = get_bits_long(gbc, leading_zeroes + 1);
+
+ if (unsigned_value & 1)
+ value = -(int32_t)(unsigned_value / 2);
else
- value = v / 2;
+ value = unsigned_value / 2;
- if (ctx->trace_enable)
- ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
- bits, value);
+ CBS_TRACE_READ_END();
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
@@ -146,6 +122,8 @@ static int cbs_write_ue_golomb(CodedBitstreamContext *ctx, PutBitContext *pbc,
{
int len;
+ CBS_TRACE_WRITE_START();
+
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
@@ -158,27 +136,14 @@ static int cbs_write_ue_golomb(CodedBitstreamContext *ctx, PutBitContext *pbc,
if (put_bits_left(pbc) < 2 * len + 1)
return AVERROR(ENOSPC);
- if (ctx->trace_enable) {
- char bits[65];
- int i;
-
- for (i = 0; i < len; i++)
- bits[i] = '0';
- bits[len] = '1';
- for (i = 0; i < len; i++)
- bits[len + i + 1] = (value + 1) >> (len - i - 1) & 1 ? '1' : '0';
- bits[len + len + 1] = 0;
-
- ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
- name, subscripts, bits, value);
- }
-
put_bits(pbc, len, 0);
if (len + 1 < 32)
put_bits(pbc, len + 1, value + 1);
else
put_bits32(pbc, value + 1);
+ CBS_TRACE_WRITE_END();
+
return 0;
}
@@ -190,6 +155,8 @@ static int cbs_write_se_golomb(CodedBitstreamContext *ctx, PutBitContext *pbc,
int len;
uint32_t uvalue;
+ CBS_TRACE_WRITE_START();
+
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
@@ -209,27 +176,14 @@ static int cbs_write_se_golomb(CodedBitstreamContext *ctx, PutBitContext *pbc,
if (put_bits_left(pbc) < 2 * len + 1)
return AVERROR(ENOSPC);
- if (ctx->trace_enable) {
- char bits[65];
- int i;
-
- for (i = 0; i < len; i++)
- bits[i] = '0';
- bits[len] = '1';
- for (i = 0; i < len; i++)
- bits[len + i + 1] = (uvalue + 1) >> (len - i - 1) & 1 ? '1' : '0';
- bits[len + len + 1] = 0;
-
- ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
- name, subscripts, bits, value);
- }
-
put_bits(pbc, len, 0);
if (len + 1 < 32)
put_bits(pbc, len + 1, uvalue + 1);
else
put_bits32(pbc, uvalue + 1);
+ CBS_TRACE_WRITE_END();
+
return 0;
}
@@ -157,10 +157,6 @@ typedef struct CodedBitstreamType {
void ff_cbs_trace_header(CodedBitstreamContext *ctx,
const char *name);
-void ff_cbs_trace_syntax_element(CodedBitstreamContext *ctx, int position,
- const char *name, const int *subscripts,
- const char *bitstring, int64_t value);
-
// Helper functions for read/write of common bitstream elements, including
// generation of trace output. The simple functions are equivalent to
@@ -206,6 +202,87 @@ int ff_cbs_write_signed(CodedBitstreamContext *ctx, PutBitContext *pbc,
// range_min in the above functions.
#define MIN_INT_BITS(length) (-(INT64_C(1) << ((length) - 1)))
+
+// Start of a syntax element during read tracing.
+#define CBS_TRACE_READ_START() \
+ GetBitContext trace_start; \
+ do { \
+ if (ctx->trace_enable) \
+ trace_start = *gbc; \
+ } while (0)
+
+// End of a syntax element for tracing, make callback.
+#define CBS_TRACE_READ_END() \
+ do { \
+ if (ctx->trace_enable) { \
+ int start_position = get_bits_count(&trace_start); \
+ int end_position = get_bits_count(gbc); \
+ av_assert0(start_position <= end_position); \
+ ctx->trace_read_callback(ctx, &trace_start, \
+ end_position - start_position, \
+ name, subscripts, value); \
+ } \
+ } while (0)
+
+// End of a syntax element with no subscript entries.
+#define CBS_TRACE_READ_END_NO_SUBSCRIPTS() \
+ do { \
+ const int *subscripts = NULL; \
+ CBS_TRACE_READ_END(); \
+ } while (0)
+
+// End of a syntax element which is made up of subelements which
+// are aleady traced, so we are only showing the value.
+#define CBS_TRACE_READ_END_VALUE_ONLY() \
+ do { \
+ if (ctx->trace_enable) { \
+ ctx->trace_read_callback(ctx, &trace_start, 0, \
+ name, subscripts, value); \
+ } \
+ } while (0)
+
+// Start of a syntax element during write tracing.
+#define CBS_TRACE_WRITE_START() \
+ int start_position; \
+ do { \
+ if (ctx->trace_enable) \
+ start_position = put_bits_count(pbc);; \
+ } while (0)
+
+// End of a syntax element for tracing, make callback.
+#define CBS_TRACE_WRITE_END() \
+ do { \
+ if (ctx->trace_enable) { \
+ int end_position = put_bits_count(pbc); \
+ av_assert0(start_position <= end_position); \
+ ctx->trace_write_callback(ctx, pbc, \
+ end_position - start_position, \
+ name, subscripts, value); \
+ } \
+ } while (0)
+
+// End of a syntax element with no subscript entries.
+#define CBS_TRACE_WRITE_END_NO_SUBSCRIPTS() \
+ do { \
+ const int *subscripts = NULL; \
+ CBS_TRACE_WRITE_END(); \
+ } while (0)
+
+// End of a syntax element which is made up of subelements which are
+// aleady traced, so we are only showing the value. This forges a
+// PutBitContext to point to the position of the start of the syntax
+// element, but the other state doesn't matter because length is zero.
+#define CBS_TRACE_WRITE_END_VALUE_ONLY() \
+ do { \
+ if (ctx->trace_enable) { \
+ PutBitContext tmp; \
+ init_put_bits(&tmp, pbc->buf, start_position); \
+ skip_put_bits(&tmp, start_position); \
+ ctx->trace_write_callback(ctx, &tmp, 0, \
+ name, subscripts, value); \
+ } \
+ } while (0)
+
#define TYPE_LIST(...) { __VA_ARGS__ }
#define CBS_UNIT_TYPE_POD(type_, structure) { \
.nb_unit_types = 1, \
@@ -28,11 +28,10 @@ static int cbs_vp9_read_s(CodedBitstreamContext *ctx, GetBitContext *gbc,
const int *subscripts, int32_t *write_to)
{
uint32_t magnitude;
- int position, sign;
+ int sign;
int32_t value;
- if (ctx->trace_enable)
- position = get_bits_count(gbc);
+ CBS_TRACE_READ_START();
if (get_bits_left(gbc) < width + 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid signed value at "
@@ -44,17 +43,7 @@ static int cbs_vp9_read_s(CodedBitstreamContext *ctx, GetBitContext *gbc,
sign = get_bits1(gbc);
value = sign ? -(int32_t)magnitude : magnitude;
- if (ctx->trace_enable) {
- char bits[33];
- int i;
- for (i = 0; i < width; i++)
- bits[i] = magnitude >> (width - i - 1) & 1 ? '1' : '0';
- bits[i] = sign ? '1' : '0';
- bits[i + 1] = 0;
-
- ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
- bits, value);
- }
+ CBS_TRACE_READ_END();
*write_to = value;
return 0;
@@ -67,27 +56,19 @@ static int cbs_vp9_write_s(CodedBitstreamContext *ctx, PutBitContext *pbc,
uint32_t magnitude;
int sign;
+ CBS_TRACE_WRITE_START();
+
if (put_bits_left(pbc) < width + 1)
return AVERROR(ENOSPC);
sign = value < 0;
magnitude = sign ? -value : value;
- if (ctx->trace_enable) {
- char bits[33];
- int i;
- for (i = 0; i < width; i++)
- bits[i] = magnitude >> (width - i - 1) & 1 ? '1' : '0';
- bits[i] = sign ? '1' : '0';
- bits[i + 1] = 0;
-
- ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
- name, subscripts, bits, value);
- }
-
put_bits(pbc, width, magnitude);
put_bits(pbc, 1, sign);
+ CBS_TRACE_WRITE_END();
+
return 0;
}
@@ -96,32 +77,24 @@ static int cbs_vp9_read_increment(CodedBitstreamContext *ctx, GetBitContext *gbc
const char *name, uint32_t *write_to)
{
uint32_t value;
- int position, i;
- char bits[8];
- av_assert0(range_min <= range_max && range_max - range_min < sizeof(bits) - 1);
- if (ctx->trace_enable)
- position = get_bits_count(gbc);
+ CBS_TRACE_READ_START();
- for (i = 0, value = range_min; value < range_max;) {
+ av_assert0(range_min <= range_max && range_max - range_min < 32);
+
+ for (value = range_min; value < range_max;) {
if (get_bits_left(gbc) < 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid increment value at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
- if (get_bits1(gbc)) {
- bits[i++] = '1';
+ if (get_bits1(gbc))
++value;
- } else {
- bits[i++] = '0';
+ else
break;
- }
}
- if (ctx->trace_enable) {
- bits[i] = 0;
- ff_cbs_trace_syntax_element(ctx, position, name, NULL, bits, value);
- }
+ CBS_TRACE_READ_END_NO_SUBSCRIPTS();
*write_to = value;
return 0;
@@ -133,6 +106,8 @@ static int cbs_vp9_write_increment(CodedBitstreamContext *ctx, PutBitContext *pb
{
int len;
+ CBS_TRACE_WRITE_START();
+
av_assert0(range_min <= range_max && range_max - range_min < 8);
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
@@ -148,23 +123,11 @@ static int cbs_vp9_write_increment(CodedBitstreamContext *ctx, PutBitContext *pb
if (put_bits_left(pbc) < len)
return AVERROR(ENOSPC);
- if (ctx->trace_enable) {
- char bits[8];
- int i;
- for (i = 0; i < len; i++) {
- if (range_min + i == value)
- bits[i] = '0';
- else
- bits[i] = '1';
- }
- bits[i] = 0;
- ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
- name, NULL, bits, value);
- }
-
if (len > 0)
put_bits(pbc, len, (1 << len) - 1 - (value != range_max));
+ CBS_TRACE_WRITE_END_NO_SUBSCRIPTS();
+
return 0;
}
@@ -173,12 +136,11 @@ static int cbs_vp9_read_le(CodedBitstreamContext *ctx, GetBitContext *gbc,
const int *subscripts, uint32_t *write_to)
{
uint32_t value;
- int position, b;
+ int b;
- av_assert0(width % 8 == 0);
+ CBS_TRACE_READ_START();
- if (ctx->trace_enable)
- position = get_bits_count(gbc);
+ av_assert0(width % 8 == 0);
if (get_bits_left(gbc) < width) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid le value at "
@@ -190,17 +152,7 @@ static int cbs_vp9_read_le(CodedBitstreamContext *ctx, GetBitContext *gbc,
for (b = 0; b < width; b += 8)
value |= get_bits(gbc, 8) << b;
- if (ctx->trace_enable) {
- char bits[33];
- int i;
- for (b = 0; b < width; b += 8)
- for (i = 0; i < 8; i++)
- bits[b + i] = value >> (b + i) & 1 ? '1' : '0';
- bits[b] = 0;
-
- ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
- bits, value);
- }
+ CBS_TRACE_READ_END();
*write_to = value;
return 0;
@@ -212,26 +164,18 @@ static int cbs_vp9_write_le(CodedBitstreamContext *ctx, PutBitContext *pbc,
{
int b;
+ CBS_TRACE_WRITE_START();
+
av_assert0(width % 8 == 0);
if (put_bits_left(pbc) < width)
return AVERROR(ENOSPC);
- if (ctx->trace_enable) {
- char bits[33];
- int i;
- for (b = 0; b < width; b += 8)
- for (i = 0; i < 8; i++)
- bits[b + i] = value >> (b + i) & 1 ? '1' : '0';
- bits[b] = 0;
-
- ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
- name, subscripts, bits, value);
- }
-
for (b = 0; b < width; b += 8)
put_bits(pbc, 8, value >> b & 0xff);
+ CBS_TRACE_WRITE_END();
+
return 0;
}
@@ -44,6 +44,7 @@ static int trace_headers_init(AVBSFContext *bsf)
ctx->cbc->trace_enable = 1;
ctx->cbc->trace_level = AV_LOG_INFO;
+ ctx->cbc->trace_read_callback = ff_cbs_trace_read_log;
if (bsf->par_in->extradata) {
CodedBitstreamFragment *frag = &ctx->fragment;