@@ -6,6 +6,8 @@ version <next>:
- Playdate video decoder and demuxer
- Extend VAAPI support for libva-win32 on Windows
- animated WebP parser/decoder
+- animated WebP parser/decoder
+- animated WebP demuxer
version 6.0:
- Radiance HDR image support
@@ -936,4 +936,32 @@ which in turn, acts as a ceiling for the size of scripts that can be read.
Default is 1 MiB.
@end table
+@section webp
+
+Animated WebP demuxer.
+
+It accepts the following options:
+
+@table @option
+@item -min_delay @var{int}
+Set the minimum valid delay between frames in milliseconds.
+Range is 0 to 60000. Default value is 10.
+
+@item -max_webp_delay @var{int}
+Set the maximum valid delay between frames in milliseconds.
+Range is 0 to 16777215. Default value is 16777215 (over four hours),
+the maximum value allowed by the specification.
+
+@item -default_delay @var{int}
+Set the default delay between frames in milliseconds.
+Range is 0 to 60000. Default value is 100.
+
+@item -ignore_loop @var{bool}
+WebP files can contain information to loop a certain number of times
+(or infinitely). If @option{ignore_loop} is set to true, then the loop
+setting from the input will be ignored and looping will not occur.
+If set to false, then looping will occur and will cycle the number
+of times according to the WebP. Default value is true.
+@end table
+
@c man end DEMUXERS
@@ -609,6 +609,7 @@ OBJS-$(CONFIG_WEBM_MUXER) += matroskaenc.o matroska.o \
av1.o avlanguage.o
OBJS-$(CONFIG_WEBM_DASH_MANIFEST_MUXER) += webmdashenc.o
OBJS-$(CONFIG_WEBM_CHUNK_MUXER) += webm_chunk.o
+OBJS-$(CONFIG_WEBP_DEMUXER) += webpdec.o
OBJS-$(CONFIG_WEBP_MUXER) += webpenc.o
OBJS-$(CONFIG_WEBVTT_DEMUXER) += webvttdec.o subtitles.o
OBJS-$(CONFIG_WEBVTT_MUXER) += webvttenc.o
@@ -493,6 +493,7 @@ extern const AVInputFormat ff_webm_dash_manifest_demuxer;
extern const FFOutputFormat ff_webm_dash_manifest_muxer;
extern const FFOutputFormat ff_webm_chunk_muxer;
extern const FFOutputFormat ff_webp_muxer;
+extern const AVInputFormat ff_webp_demuxer;
extern const AVInputFormat ff_webvtt_demuxer;
extern const FFOutputFormat ff_webvtt_muxer;
extern const AVInputFormat ff_wsaud_demuxer;
@@ -32,7 +32,7 @@
#include "version_major.h"
#define LIBAVFORMAT_VERSION_MINOR 5
-#define LIBAVFORMAT_VERSION_MICRO 100
+#define LIBAVFORMAT_VERSION_MICRO 101
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
LIBAVFORMAT_VERSION_MINOR, \
new file mode 100644
@@ -0,0 +1,733 @@
+/*
+ * WebP demuxer
+ * Copyright (c) 2020 Pexeso Inc.
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * WebP demuxer.
+ */
+
+#include "avformat.h"
+#include "avio_internal.h"
+#include "internal.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/opt.h"
+#include "libavcodec/webp.h"
+
+/**
+ * WebP headers (chunks before the first frame) and important info from them.
+ */
+typedef struct WebPHeaders {
+ int64_t offset; ///< offset in the (concatenated) file
+ uint8_t *data; ///< raw data
+ uint32_t size; ///< size of data
+ uint32_t webp_size; ///< size of the WebP file
+ int canvas_width; ///< width of the canvas
+ int canvas_height; ///< height of the canvas
+ int num_loop; ///< number of times to loop the animation
+} WebPHeaders;
+
+typedef struct WebPDemuxContext {
+ const AVClass *class;
+ /**
+ * Time span in milliseconds before the next frame
+ * should be drawn on screen.
+ */
+ int delay;
+ /**
+ * Minimum allowed delay between frames in milliseconds.
+ * Values below this threshold are considered to be invalid
+ * and set to value of default_delay.
+ */
+ int min_delay;
+ int max_delay;
+ int default_delay;
+
+ /*
+ * loop options
+ */
+ int ignore_loop; ///< ignore loop setting
+ int num_loop; ///< number of times to loop the animation
+ int cur_loop; ///< current loop counter
+ int64_t file_start; ///< start position of the current animation file
+ int64_t infinite_loop_start; ///< start position of the infinite loop
+
+ uint32_t remaining_size; ///< remaining size of the current animation file
+ int64_t seekback_buffer_end; ///< position of the end of the seek back buffer
+ int64_t prev_end_position; ///< position after the previous packet
+ size_t num_webp_headers; ///< number of (concatenated) WebP files' headers
+ WebPHeaders *webp_headers; ///< (concatenated) WebP files' headers
+
+ /*
+ * variables for the key frame detection
+ */
+ int nb_frames; ///< number of frames of the current animation file
+ int canvas_width; ///< width of the canvas
+ int canvas_height; ///< height of the canvas
+ int prev_width; ///< width of the previous frame
+ int prev_height; ///< height of the previous frame
+ int prev_anmf_flags; ///< flags of the previous frame
+ int prev_key_frame; ///< flag if the previous frame was a key frame
+} WebPDemuxContext;
+
+/**
+ * Major web browsers display WebPs at ~10-15fps when rate is not
+ * explicitly set or have too low values. We assume default rate to be 10.
+ * Default delay = 1000 microseconds / 10fps = 100 milliseconds per frame.
+ */
+#define WEBP_DEFAULT_DELAY 100
+/**
+ * By default delay values less than this threshold considered to be invalid.
+ */
+#define WEBP_MIN_DELAY 10
+
+static int webp_probe(const AVProbeData *p)
+{
+ const uint8_t *b = p->buf;
+
+ if (AV_RB32(b) == MKBETAG('R', 'I', 'F', 'F') &&
+ AV_RB32(b + 8) == MKBETAG('W', 'E', 'B', 'P'))
+ return AVPROBE_SCORE_MAX;
+
+ return 0;
+}
+
+static int ensure_seekback(AVFormatContext *s, int64_t bytes)
+{
+ WebPDemuxContext *wdc = s->priv_data;
+ AVIOContext *pb = s->pb;
+ int ret;
+
+ int64_t pos = avio_tell(pb);
+ if (pos < 0)
+ return pos;
+
+ if (pos + bytes <= wdc->seekback_buffer_end)
+ return 0;
+
+ if ((ret = ffio_ensure_seekback(pb, bytes)) < 0)
+ return ret;
+
+ wdc->seekback_buffer_end = pos + bytes;
+ return 0;
+}
+
+static int resync(AVFormatContext *s, int seek_to_start)
+{
+ WebPDemuxContext *wdc = s->priv_data;
+ AVIOContext *pb = s->pb;
+ int ret;
+ int i;
+ uint64_t state = 0;
+
+ // ensure seek back for the file header and the first chunk header
+ if ((ret = ensure_seekback(s, 12 + 8)) < 0)
+ return ret;
+
+ for (i = 0; i < 12; i++) {
+ state = (state << 8) | avio_r8(pb);
+ if (i == 11) {
+ if ((uint32_t) state == MKBETAG('W', 'E', 'B', 'P'))
+ break;
+ i -= 4;
+ }
+ if (i == 7) {
+ // ensure seek back for the rest of file header and the chunk header
+ if ((ret = ensure_seekback(s, 4 + 8)) < 0)
+ return ret;
+
+ if ((state >> 32) != MKBETAG('R', 'I', 'F', 'F'))
+ i--;
+ else {
+ uint32_t fsize = av_bswap32(state);
+ if (!(fsize > 15 && fsize <= UINT32_MAX - 10))
+ i -= 4;
+ else
+ wdc->remaining_size = fsize - 4;
+ }
+ }
+ if (avio_feof(pb))
+ return AVERROR_EOF;
+ }
+
+ wdc->file_start = avio_tell(pb) - 12;
+
+ if (seek_to_start) {
+ if ((ret = avio_seek(pb, -12, SEEK_CUR)) < 0)
+ return ret;
+ wdc->remaining_size += 12;
+ }
+
+ return 0;
+}
+
+static int is_key_frame(AVFormatContext *s, int has_alpha, int anmf_flags,
+ int width, int height)
+{
+ WebPDemuxContext *wdc = s->priv_data;
+
+ if (wdc->nb_frames == 1)
+ return 1;
+
+ if (width == wdc->canvas_width &&
+ height == wdc->canvas_height &&
+ (!has_alpha || (anmf_flags & ANMF_BLENDING_METHOD) == ANMF_BLENDING_METHOD_OVERWRITE))
+ return 1;
+
+ if ((wdc->prev_anmf_flags & ANMF_DISPOSAL_METHOD) == ANMF_DISPOSAL_METHOD_BACKGROUND &&
+ (wdc->prev_key_frame || (wdc->prev_width == wdc->canvas_width &&
+ wdc->prev_height == wdc->canvas_height)))
+ return 1;
+
+ return 0;
+}
+
+static int webp_read_header(AVFormatContext *s)
+{
+ WebPDemuxContext *wdc = s->priv_data;
+ AVIOContext *pb = s->pb;
+ AVStream *st;
+ int ret, n;
+ uint32_t chunk_type, chunk_size;
+ int canvas_width = 0;
+ int canvas_height = 0;
+ int width = 0;
+ int height = 0;
+ int is_frame = 0;
+
+ wdc->delay = wdc->default_delay;
+ wdc->num_loop = 1;
+ wdc->infinite_loop_start = -1;
+
+ if ((ret = resync(s, 0)) < 0)
+ return ret;
+
+ st = avformat_new_stream(s, NULL);
+ if (!st)
+ return AVERROR(ENOMEM);
+
+ while (!is_frame && wdc->remaining_size > 0 && !avio_feof(pb)) {
+ chunk_type = avio_rl32(pb);
+ chunk_size = avio_rl32(pb);
+ if (chunk_size == UINT32_MAX)
+ return AVERROR_INVALIDDATA;
+ chunk_size += chunk_size & 1;
+ if (avio_feof(pb))
+ break;
+
+ if (wdc->remaining_size < 8 + chunk_size)
+ return AVERROR_INVALIDDATA;
+ wdc->remaining_size -= 8 + chunk_size;
+
+ // ensure seek back for the chunk body and the next chunk header
+ if ((ret = ensure_seekback(s, chunk_size + 8)) < 0)
+ return ret;
+
+ switch (chunk_type) {
+ case MKTAG('V', 'P', '8', 'X'):
+ if (chunk_size >= 10) {
+ avio_skip(pb, 4);
+ canvas_width = avio_rl24(pb) + 1;
+ canvas_height = avio_rl24(pb) + 1;
+ ret = avio_skip(pb, chunk_size - 10);
+ } else
+ ret = avio_skip(pb, chunk_size);
+ break;
+ case MKTAG('V', 'P', '8', ' '):
+ if (chunk_size >= 10) {
+ avio_skip(pb, 6);
+ width = avio_rl16(pb) & 0x3fff;
+ height = avio_rl16(pb) & 0x3fff;
+ is_frame = 1;
+ ret = avio_skip(pb, chunk_size - 10);
+ } else
+ ret = avio_skip(pb, chunk_size);
+ break;
+ case MKTAG('V', 'P', '8', 'L'):
+ if (chunk_size >= 5) {
+ avio_skip(pb, 1);
+ n = avio_rl32(pb);
+ width = (n & 0x3fff) + 1; // first 14 bits
+ height = ((n >> 14) & 0x3fff) + 1; // next 14 bits
+ is_frame = 1;
+ ret = avio_skip(pb, chunk_size - 5);
+ } else
+ ret = avio_skip(pb, chunk_size);
+ break;
+ case MKTAG('A', 'N', 'M', 'F'):
+ if (chunk_size >= 12) {
+ avio_skip(pb, 6);
+ width = avio_rl24(pb) + 1;
+ height = avio_rl24(pb) + 1;
+ is_frame = 1;
+ ret = avio_skip(pb, chunk_size - 12);
+ } else
+ ret = avio_skip(pb, chunk_size);
+ break;
+ default:
+ ret = avio_skip(pb, chunk_size);
+ break;
+ }
+
+ if (ret < 0)
+ return ret;
+
+ // fallback if VP8X chunk was not present
+ if (!canvas_width && width > 0)
+ canvas_width = width;
+ if (!canvas_height && height > 0)
+ canvas_height = height;
+ }
+
+ // WebP format operates with time in "milliseconds", therefore timebase is 1/100
+ avpriv_set_pts_info(st, 64, 1, 1000);
+ st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
+ st->codecpar->codec_id = AV_CODEC_ID_WEBP;
+ st->codecpar->codec_tag = MKTAG('W', 'E', 'B', 'P');
+ st->codecpar->width = canvas_width;
+ st->codecpar->height = canvas_height;
+ st->start_time = 0;
+
+ // jump to start because WebP decoder needs header data too
+ if ((ret = avio_seek(pb, wdc->file_start, SEEK_SET)) < 0)
+ return ret;
+ wdc->remaining_size = 0;
+
+ return 0;
+}
+
+static WebPHeaders *webp_headers_lower_or_equal(WebPHeaders *headers, size_t n,
+ int64_t offset)
+{
+ size_t s, e;
+
+ if (n == 0)
+ return NULL;
+ if (headers[0].offset > offset)
+ return NULL;
+
+ s = 0;
+ e = n - 1;
+ while (s < e) {
+ size_t mid = (s + e + 1) / 2;
+ if (headers[mid].offset == offset)
+ return &headers[mid];
+ else if (headers[mid].offset > offset)
+ e = mid - 1;
+ else
+ s = mid;
+ }
+
+ return &headers[s];
+}
+
+static int append_chunk(WebPHeaders *headers, AVIOContext *pb,
+ uint32_t chunk_size)
+{
+ uint32_t previous_size = headers->size;
+ uint8_t *new_data;
+
+ if (headers->size > UINT32_MAX - chunk_size)
+ return AVERROR_INVALIDDATA;
+
+ new_data = av_realloc(headers->data, headers->size + chunk_size);
+ if (!new_data)
+ return AVERROR(ENOMEM);
+
+ headers->data = new_data;
+ headers->size += chunk_size;
+
+ return avio_read(pb, headers->data + previous_size, chunk_size);
+}
+
+static int webp_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+ WebPDemuxContext *wdc = s->priv_data;
+ AVIOContext *pb = s->pb;
+ int ret, n;
+ int64_t packet_start = avio_tell(pb), packet_end;
+ uint32_t chunk_type, chunk_size;
+ int width = 0, height = 0;
+ int is_frame = 0;
+ int key_frame = 0;
+ int anmf_flags = 0;
+ int has_alpha = 0;
+ int reading_headers = 0;
+ int reset_key_frame = 0;
+ WebPHeaders *headers = NULL;
+
+ if (packet_start != wdc->prev_end_position) {
+ // seek occurred, find the corresponding WebP headers
+ headers = webp_headers_lower_or_equal(wdc->webp_headers, wdc->num_webp_headers,
+ packet_start);
+ if (!headers)
+ return AVERROR_BUG;
+
+ wdc->file_start = headers->offset;
+ wdc->remaining_size = headers->webp_size - (packet_start - headers->offset);
+ wdc->canvas_width = headers->canvas_width;
+ wdc->canvas_height = headers->canvas_height;
+ wdc->num_loop = headers->num_loop;
+ wdc->cur_loop = 0;
+ reset_key_frame = 1;
+ }
+
+ if (wdc->remaining_size == 0) {
+ // if the loop count is finite, loop the current animation
+ if (avio_tell(pb) != wdc->file_start &&
+ !wdc->ignore_loop && wdc->num_loop > 1 && ++wdc->cur_loop < wdc->num_loop) {
+ if ((ret = avio_seek(pb, wdc->file_start, SEEK_SET)) < 0)
+ return ret;
+ packet_start = avio_tell(pb);
+ } else {
+ // start of a new animation file
+ wdc->delay = wdc->default_delay;
+ if (wdc->num_loop)
+ wdc->num_loop = 1;
+ }
+
+ // resync to the start of the next file
+ ret = resync(s, 1);
+ if (ret == AVERROR_EOF) {
+ // we reached EOF, if the loop count is infinite, loop the whole input
+ if (!wdc->ignore_loop && !wdc->num_loop) {
+ if ((ret = avio_seek(pb, wdc->infinite_loop_start, SEEK_SET)) < 0)
+ return ret;
+ ret = resync(s, 1);
+ } else {
+ wdc->prev_end_position = avio_tell(pb);
+ return AVERROR_EOF;
+ }
+ }
+ if (ret < 0)
+ return ret;
+ packet_start = avio_tell(pb);
+
+ reset_key_frame = 1;
+ }
+
+ if (reset_key_frame) {
+ // reset variables used for key frame detection
+ wdc->nb_frames = 0;
+ wdc->canvas_width = 0;
+ wdc->canvas_height = 0;
+ wdc->prev_width = 0;
+ wdc->prev_height = 0;
+ wdc->prev_anmf_flags = 0;
+ wdc->prev_key_frame = 0;
+ }
+
+ if (packet_start == wdc->file_start) {
+ headers = webp_headers_lower_or_equal(wdc->webp_headers, wdc->num_webp_headers,
+ packet_start);
+ if (!headers || headers->offset != wdc->file_start) {
+ // grow the array of WebP files' headers
+ wdc->num_webp_headers++;
+ wdc->webp_headers = av_realloc_f(wdc->webp_headers,
+ wdc->num_webp_headers,
+ sizeof(WebPHeaders));
+ if (!wdc->webp_headers)
+ return AVERROR(ENOMEM);
+
+ headers = &wdc->webp_headers[wdc->num_webp_headers - 1];
+ memset(headers, 0, sizeof(*headers));
+ headers->offset = wdc->file_start;
+ } else {
+ // headers for this WebP file have been already read, skip them
+ if ((ret = avio_seek(pb, headers->size, SEEK_CUR)) < 0)
+ return ret;
+ packet_start = avio_tell(pb);
+
+ wdc->remaining_size = headers->webp_size - headers->size;
+ wdc->canvas_width = headers->canvas_width;
+ wdc->canvas_height = headers->canvas_height;
+
+ if (wdc->cur_loop >= wdc->num_loop)
+ wdc->cur_loop = 0;
+ wdc->num_loop = headers->num_loop;
+ }
+ }
+
+ while (wdc->remaining_size > 0 && !avio_feof(pb)) {
+ chunk_type = avio_rl32(pb);
+ chunk_size = avio_rl32(pb);
+ if (chunk_size == UINT32_MAX)
+ return AVERROR_INVALIDDATA;
+ chunk_size += chunk_size & 1;
+
+ if (avio_feof(pb))
+ break;
+
+ // dive into RIFF chunk and do not ensure seek back for the whole file
+ if (chunk_type == MKTAG('R', 'I', 'F', 'F') && chunk_size > 4)
+ chunk_size = 4;
+
+ // ensure seek back for the chunk body and the next chunk header
+ if ((ret = ensure_seekback(s, chunk_size + 8)) < 0)
+ return ret;
+
+ switch (chunk_type) {
+ case MKTAG('R', 'I', 'F', 'F'):
+ if (avio_tell(pb) != wdc->file_start + 8) {
+ // premature RIFF found, shorten the file size
+ WebPHeaders *tmp = webp_headers_lower_or_equal(wdc->webp_headers,
+ wdc->num_webp_headers,
+ avio_tell(pb));
+ tmp->webp_size -= wdc->remaining_size;
+ wdc->remaining_size = 0;
+ goto flush;
+ }
+
+ reading_headers = 1;
+ if ((ret = avio_seek(pb, -8, SEEK_CUR)) < 0 ||
+ (ret = append_chunk(headers, pb, 8 + chunk_size)) < 0)
+ return ret;
+ packet_start = avio_tell(pb);
+
+ headers->offset = wdc->file_start;
+ headers->webp_size = 8 + AV_RL32(headers->data + headers->size - chunk_size - 4);
+ break;
+ case MKTAG('V', 'P', '8', 'X'):
+ reading_headers = 1;
+ if ((ret = avio_seek(pb, -8, SEEK_CUR)) < 0 ||
+ (ret = append_chunk(headers, pb, 8 + chunk_size)) < 0)
+ return ret;
+ packet_start = avio_tell(pb);
+
+ if (chunk_size >= 10) {
+ headers->canvas_width = AV_RL24(headers->data + headers->size - chunk_size + 4) + 1;
+ headers->canvas_height = AV_RL24(headers->data + headers->size - chunk_size + 7) + 1;
+ }
+ break;
+ case MKTAG('A', 'N', 'I', 'M'):
+ reading_headers = 1;
+ if ((ret = avio_seek(pb, -8, SEEK_CUR)) < 0 ||
+ (ret = append_chunk(headers, pb, 8 + chunk_size)) < 0)
+ return ret;
+ packet_start = avio_tell(pb);
+
+ if (chunk_size >= 6) {
+ headers->num_loop = AV_RL16(headers->data + headers->size - chunk_size + 4);
+ wdc->num_loop = headers->num_loop;
+ wdc->cur_loop = 0;
+ if (!wdc->ignore_loop && wdc->num_loop != 1) {
+ // ensure seek back for the rest of the file
+ // and for the header of the next concatenated file
+ uint32_t loop_end = wdc->remaining_size - chunk_size + 12;
+ if ((ret = ensure_seekback(s, loop_end)) < 0)
+ return ret;
+
+ if (!wdc->num_loop && wdc->infinite_loop_start < 0)
+ wdc->infinite_loop_start = wdc->file_start;
+ }
+ }
+ break;
+ case MKTAG('V', 'P', '8', ' '):
+ if (is_frame)
+ // found a start of the next non-animated frame
+ goto flush;
+ is_frame = 1;
+
+ reading_headers = 0;
+ if (chunk_size >= 10) {
+ avio_skip(pb, 6);
+ width = avio_rl16(pb) & 0x3fff;
+ height = avio_rl16(pb) & 0x3fff;
+ wdc->nb_frames++;
+ ret = avio_skip(pb, chunk_size - 10);
+ } else
+ ret = avio_skip(pb, chunk_size);
+ break;
+ case MKTAG('V', 'P', '8', 'L'):
+ if (is_frame)
+ // found a start of the next non-animated frame
+ goto flush;
+ is_frame = 1;
+
+ reading_headers = 0;
+ if (chunk_size >= 5) {
+ avio_skip(pb, 1);
+ n = avio_rl32(pb);
+ width = (n & 0x3fff) + 1; // first 14 bits
+ height = ((n >> 14) & 0x3fff) + 1; ///next 14 bits
+ has_alpha = (n >> 28) & 1; // next 1 bit
+ wdc->nb_frames++;
+ ret = avio_skip(pb, chunk_size - 5);
+ } else
+ ret = avio_skip(pb, chunk_size);
+ break;
+ case MKTAG('A', 'N', 'M', 'F'):
+ if (is_frame)
+ // found a start of the next animated frame
+ goto flush;
+
+ reading_headers = 0;
+ if (chunk_size >= 16) {
+ avio_skip(pb, 6);
+ width = avio_rl24(pb) + 1;
+ height = avio_rl24(pb) + 1;
+ wdc->delay = avio_rl24(pb);
+ anmf_flags = avio_r8(pb);
+ if (wdc->delay < wdc->min_delay)
+ wdc->delay = wdc->default_delay;
+ wdc->delay = FFMIN(wdc->delay, wdc->max_delay);
+ // dive into the chunk to set the has_alpha flag
+ chunk_size = 16;
+ ret = 0;
+ } else
+ ret = avio_skip(pb, chunk_size);
+ break;
+ case MKTAG('A', 'L', 'P', 'H'):
+ reading_headers = 0;
+ has_alpha = 1;
+ ret = avio_skip(pb, chunk_size);
+ break;
+ default:
+ if (reading_headers) {
+ if ((ret = avio_seek(pb, -8, SEEK_CUR)) < 0 ||
+ (ret = append_chunk(headers, pb, 8 + chunk_size)) < 0)
+ return ret;
+ packet_start = avio_tell(pb);
+ } else
+ ret = avio_skip(pb, chunk_size);
+ break;
+ }
+ if (ret == AVERROR_EOF) {
+ // EOF was reached but the position may still be in the middle
+ // of the buffer. Seek to the end of the buffer so that EOF is
+ // handled properly in the next invocation of webp_read_packet.
+ if ((ret = avio_seek(pb, pb->buf_end - pb->buf_ptr, SEEK_CUR) < 0))
+ return ret;
+ wdc->prev_end_position = avio_tell(pb);
+ wdc->remaining_size = 0;
+ return AVERROR_EOF;
+ }
+ if (ret < 0)
+ return ret;
+
+ // fallback if VP8X chunk was not present
+ if (headers) {
+ if (!headers->canvas_width && width > 0)
+ headers->canvas_width = width;
+ if (!headers->canvas_height && height > 0)
+ headers->canvas_height = height;
+ }
+
+ if (wdc->remaining_size < 8 + chunk_size)
+ return AVERROR_INVALIDDATA;
+ wdc->remaining_size -= 8 + chunk_size;
+
+ packet_end = avio_tell(pb);
+ }
+
+ if (wdc->remaining_size > 0 && avio_feof(pb)) {
+ // premature EOF, shorten the file size
+ WebPHeaders *tmp = webp_headers_lower_or_equal(wdc->webp_headers,
+ wdc->num_webp_headers,
+ avio_tell(pb));
+ tmp->webp_size -= wdc->remaining_size;
+ wdc->remaining_size = 0;
+ }
+
+flush:
+ if ((ret = avio_seek(pb, packet_start, SEEK_SET)) < 0)
+ return ret;
+
+ if ((ret = av_get_packet(pb, pkt, packet_end - packet_start)) < 0)
+ return ret;
+
+ wdc->prev_end_position = packet_end;
+
+ if (headers && headers->data) {
+ uint8_t *data = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
+ headers->size);
+ if (!data)
+ return AVERROR(ENOMEM);
+ memcpy(data, headers->data, headers->size);
+
+ ffstream(s->streams[0])->need_context_update = 1;
+ s->streams[0]->codecpar->width = headers->canvas_width;
+ s->streams[0]->codecpar->height = headers->canvas_height;
+
+ // copy the fields needed for the key frame detection
+ wdc->canvas_width = headers->canvas_width;
+ wdc->canvas_height = headers->canvas_height;
+ }
+
+ key_frame = is_frame && is_key_frame(s, has_alpha, anmf_flags, width, height);
+ if (key_frame)
+ pkt->flags |= AV_PKT_FLAG_KEY;
+ else
+ pkt->flags &= ~AV_PKT_FLAG_KEY;
+
+ wdc->prev_width = width;
+ wdc->prev_height = height;
+ wdc->prev_anmf_flags = anmf_flags;
+ wdc->prev_key_frame = key_frame;
+
+ pkt->stream_index = 0;
+ pkt->duration = is_frame ? wdc->delay : 0;
+ pkt->pts = pkt->dts = AV_NOPTS_VALUE;
+
+ if (is_frame && wdc->nb_frames == 1)
+ s->streams[0]->r_frame_rate = (AVRational) {1000, pkt->duration};
+
+ return ret;
+}
+
+static int webp_read_close(AVFormatContext *s)
+{
+ WebPDemuxContext *wdc = s->priv_data;
+
+ for (size_t i = 0; i < wdc->num_webp_headers; ++i)
+ av_freep(&wdc->webp_headers[i].data);
+ av_freep(&wdc->webp_headers);
+ wdc->num_webp_headers = 0;
+
+ return 0;
+}
+
+static const AVOption options[] = {
+ { "min_delay" , "minimum valid delay between frames (in milliseconds)", offsetof(WebPDemuxContext, min_delay) , AV_OPT_TYPE_INT, {.i64 = WEBP_MIN_DELAY} , 0, 1000 * 60, AV_OPT_FLAG_DECODING_PARAM },
+ { "max_webp_delay", "maximum valid delay between frames (in milliseconds)", offsetof(WebPDemuxContext, max_delay) , AV_OPT_TYPE_INT, {.i64 = 0xffffff} , 0, 0xffffff , AV_OPT_FLAG_DECODING_PARAM },
+ { "default_delay" , "default delay between frames (in milliseconds)" , offsetof(WebPDemuxContext, default_delay), AV_OPT_TYPE_INT, {.i64 = WEBP_DEFAULT_DELAY}, 0, 1000 * 60, AV_OPT_FLAG_DECODING_PARAM },
+ { "ignore_loop" , "ignore loop setting" , offsetof(WebPDemuxContext, ignore_loop) , AV_OPT_TYPE_BOOL,{.i64 = 1} , 0, 1 , AV_OPT_FLAG_DECODING_PARAM },
+ { NULL },
+};
+
+static const AVClass demuxer_class = {
+ .class_name = "WebP demuxer",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+ .category = AV_CLASS_CATEGORY_DEMUXER,
+};
+
+AVInputFormat ff_webp_demuxer = {
+ .name = "webp",
+ .long_name = NULL_IF_CONFIG_SMALL("WebP image"),
+ .priv_data_size = sizeof(WebPDemuxContext),
+ .read_probe = webp_probe,
+ .read_header = webp_read_header,
+ .read_packet = webp_read_packet,
+ .read_close = webp_read_close,
+ .flags = AVFMT_GENERIC_INDEX,
+ .priv_class = &demuxer_class,
+};
@@ -1,4 +1,4 @@
-#tb 0: 1/25
+#tb 0: 1/10
#media_type 0: video
#codec_id 0: rawvideo
#dimensions 0: 128x128
@@ -1,4 +1,4 @@
-#tb 0: 1/25
+#tb 0: 1/10
#media_type 0: video
#codec_id 0: rawvideo
#dimensions 0: 128x128
@@ -1,4 +1,4 @@
-#tb 0: 1/25
+#tb 0: 1/10
#media_type 0: video
#codec_id 0: rawvideo
#dimensions 0: 12x8
@@ -1,4 +1,4 @@
-#tb 0: 1/25
+#tb 0: 1/10
#media_type 0: video
#codec_id 0: rawvideo
#dimensions 0: 12x8
@@ -1,4 +1,4 @@
-#tb 0: 1/25
+#tb 0: 1/10
#media_type 0: video
#codec_id 0: rawvideo
#dimensions 0: 12x8
@@ -1,4 +1,4 @@
-#tb 0: 1/25
+#tb 0: 1/10
#media_type 0: video
#codec_id 0: rawvideo
#dimensions 0: 12x8