Message ID | CADxeRwkuy0SYLCaevu9xeTxhG5L9PRBz=kdHAz4SisHOVxp+cA@mail.gmail.com |
---|---|
State | Superseded |
Headers | show |
On 2017/7/20 14:17, Steven Liu wrote: > 2017-07-20 13:29 GMT+08:00 Jun Zhao <mypopydev@gmail.com>: >> V3: re-work to support the other hwaccels, just test with vaapi, dxva2|d3d11va|videotoolbox might work as well. >> V2: re-work with new hw decoding API. >> >> _______________________________________________ >> ffmpeg-devel mailing list >> ffmpeg-devel@ffmpeg.org >> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel >> > > 已打开会话。包含1封未读邮件。 > > 跳至内容 > 通过屏幕阅读器使用 Gmail > > 搜索 > > Gmail > 写邮件 > > 标签 > > 收件箱 (1) > 已加星标 > 重要邮件 > 聊天记录 > 已发邮件 > 草稿 > 所有邮件 > 垃圾邮件 (27) > 已删除邮件 > [Gmail]/Gluster-review (493) > [Gmail]Gluster-review > [Imap]/Drafts > [Imap]/Trash > 工作邮件 > 旅行相关 > 收据 > 私人邮件 > arm-linux (2) > btrfs (25) > Deleted Messages > ffmpeg (5,060) > ffmpeg-devel (16,285) > glusterfs (945) > kernel-cn > libav (2,049) > Notes > OpenBSD_ARM > OpenBSD-announce (1) > rfc (567) > Sent Messages > SMS > 显示更多标签 > > ________________________________ > > 环聊 > > > > > 删除标签 > > > 更多操作 > > 第 1 个会话,共 19,716 个 > > > > > [FFmpeg-devel] [PATCH V3] examples/hw_decode: Add a HWAccel decoding example. > > ffmpeg-devel > x > > Jun Zhao 通过“ffmpeg.org” > > 13:29 (41分钟前) > 发送至 FFmpeg、 Mark、 wm4、 Kaixuan > 英语 > 中文 > > 翻译邮件 > 对英语停用 > V3: re-work to support the other hwaccels, just test with vaapi, > dxva2|d3d11va|videotoolbox might work as well. > V2: re-work with new hw decoding API. > > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > 附件区域 > 点击此处即可回复、回复全部或转发 > 使用了 15 GB 存储空间中的13.16 GB (87%) > 管理 > 上次帐号活动时间:1小时前 > 详细信息 > 参与者(5 人) > Zhao Jun > mypopydev@gmail.com > 显示详细信息 > > From bd8cbd5c16be3001b950f0c4ae3548909a396bc6 Mon Sep 17 00:00:00 2001 > From: Jun Zhao <jun.zhao@intel.com> > Date: Thu, 20 Jul 2017 00:58:56 -0400 > Subject: [PATCH V3] examples/hw_decode: Add a HWAccel decoding example. > > Add a HWAccel decoding example. > > Just test with vaapi, dxva2|d3d11va|videotoolbox might work as well. > > Signed-off-by: Liu, Kaixuan <kaixuan.liu@intel.com> > Signed-off-by: Jun Zhao <jun.zhao@intel.com> > --- > doc/examples/hw_decode.c | 246 +++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 246 insertions(+) > create mode 100644 doc/examples/hw_decode.c > > diff --git a/doc/examples/hw_decode.c b/doc/examples/hw_decode.c > new file mode 100644 > index 0000000000..4070a60cba > --- /dev/null > +++ b/doc/examples/hw_decode.c > @@ -0,0 +1,246 @@ > +/* > + * Copyright (c) 2017 Jun Zhao > + * Copyright (c) 2017 Kaixuan Liu > + * > + * HW Acceleration API (video decoding) decode sample > + * > + * 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 > + * HW-Accelerated decoding example. > + * > + * @example hw_decode.c > + * This example shows how to do HW-accelerated decoding with output > + * frames from the HW video surfaces. > + */ > + > +#include <stdio.h> > + > +#include <libavcodec/avcodec.h> > +#include <libavformat/avformat.h> > +#include <libavutil/pixdesc.h> > +#include <libavutil/hwcontext.h> > +#include <libavutil/opt.h> > +#include <libavutil/avassert.h> > +#include <libavutil/imgutils.h> > + > +static AVBufferRef *hw_device_ctx = NULL; > +static enum AVPixelFormat hw_pix_fmt; > +FILE *output_file = NULL; > + > +static enum AVPixelFormat hw_pix_fmts[] = { > + [AV_HWDEVICE_TYPE_CUDA] = AV_PIX_FMT_CUDA, > + [AV_HWDEVICE_TYPE_DXVA2] = AV_PIX_FMT_DXVA2_VLD, > + [AV_HWDEVICE_TYPE_D3D11VA] = AV_PIX_FMT_D3D11VA_VLD, > + [AV_HWDEVICE_TYPE_QSV] = AV_PIX_FMT_QSV, > + [AV_HWDEVICE_TYPE_VAAPI] = AV_PIX_FMT_VAAPI, > + [AV_HWDEVICE_TYPE_VDPAU] = AV_PIX_FMT_VDPAU, > + [AV_HWDEVICE_TYPE_VIDEOTOOLBOX] = AV_PIX_FMT_VIDEOTOOLBOX, > +}; > + > +static enum AVPixelFormat find_fmt_by_hw_type(const enum AVHWDeviceType type) > +{ > + if (type >= 0 && type < FF_ARRAY_ELEMS(hw_pix_fmts)) > + return hw_pix_fmts[type]; > + else > + return AV_PIX_FMT_NONE; > +} > + > +static int hw_decoder_init(AVCodecContext *ctx, const enum AVHWDeviceType type) > +{ > + int err = 0; > + > + if ((err = av_hwdevice_ctx_create(&hw_device_ctx, type, > + NULL, NULL, 0)) < 0) { > + fprintf(stderr, "Failed to create specified HW device.\n"); > + return err; > + } > + ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx); > + > + return err; > +} > + > +static enum AVPixelFormat get_hw_format(AVCodecContext *ctx, > + const enum AVPixelFormat *pix_fmts) > +{ > + const enum AVPixelFormat *p; > + > + for (p = pix_fmts; *p != -1; p++) { > + if (*p == hw_pix_fmt) > + return *p; > + } > + > + fprintf(stderr, "Failed to get HW surface format.\n"); > + return AV_PIX_FMT_NONE; > +} > + > +static int decode_write(AVCodecContext *avctx, AVPacket *packet) > +{ > + AVFrame *frame = NULL, *sw_frame = NULL; > + AVFrame *tmp_frame = NULL; > + uint8_t *buffer = NULL; > + int size; > + int ret = 0; > + > + ret = avcodec_send_packet(avctx, packet); > + if (ret < 0) { > + fprintf(stderr, "Error during decoding\n"); > + return ret; > + } > + > + while (ret >= 0) { > + if (!(frame = av_frame_alloc()) || !(sw_frame = av_frame_alloc())) > + return AVERROR(ENOMEM); > If the frame alloc success and the sw_frame alloc failure, maybe it is memleak? > or if it is just a sample, that is not the impotant point? > What about use ret = AVERROR(ENOMEM), goto fail, and add if(frame) > av_frame_free(&frame); > if (sw_frame) av_frame_free(&sw_frame); Good catch, will use goto handle this case, but I think don't need to check NULL before call av_frame_free, in the function av_frame_free, have handle with if (!frame || !*frame), so it doesn't need to check the NULL before call av_frame_free. > > + > + ret = avcodec_receive_frame(avctx, frame); > + if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) > + break; > + else if (ret < 0) { > + fprintf(stderr, "Error while decoding\n"); > + goto fail; > + } > + > + if (frame->format == hw_pix_fmt) { > + /* retrieve data from GPU to CPU */ > + if ((ret = av_hwframe_transfer_data(sw_frame, frame, 0)) < 0) { > + fprintf(stderr, "Error transferring the data to > system memory\n"); > + goto fail; > + } > + tmp_frame = sw_frame; > + } else > + tmp_frame = frame; > + > + size = av_image_get_buffer_size(tmp_frame->format, tmp_frame->width, > + tmp_frame->height, 1); > + buffer = av_malloc(size); > + if (!buffer) { > + fprintf(stderr, "Can not alloc buffer\n"); > + ret = AVERROR(ENOMEM); > + goto fail; > + } > + ret = av_image_copy_to_buffer(buffer, size, > + (const uint8_t * const *)tmp_frame->data, > + (const int > *)tmp_frame->linesize, tmp_frame->format, > + tmp_frame->width, tmp_frame->height, 1); > + if (ret < 0) { > + fprintf(stderr, "Can not copy image to buffer\n"); > + goto fail; > + } > + > + if ((ret = fwrite(buffer, 1, size, output_file)) < 0) { > + fprintf(stderr, "Failed to dump raw data.\n"); > + goto fail; > + } > + > + fail: > + av_frame_free(&frame); > + av_frame_free(&sw_frame); > + if (buffer) > + av_freep(&buffer); > + if (ret < 0) > + return ret; > + } > + > + return 0; > +} > + > +int main(int argc, char *argv[]) > +{ > + AVFormatContext *input_ctx = NULL; > + int video_stream, ret; > + AVCodecContext *decoder_ctx = NULL; > + AVCodec *decoder = NULL; > + AVPacket packet; > + enum AVHWDeviceType type; > + > + if (argc < 4) { > + fprintf(stderr, "Usage: %s <vaapi|dxva2|d3d11va> <input file> > <output file>\n", argv[0]); > + return -1; > + } > + > + av_register_all(); > + > + type = av_hwdevice_find_type_by_name(argv[1]); > + hw_pix_fmt = find_fmt_by_hw_type(type); > + > + /* open the input file */ > + if (avformat_open_input(&input_ctx, argv[2], NULL, NULL) != 0) { > + fprintf(stderr, "Cannot open input file '%s'\n", argv[1]); > + return -1; > + } > + > + if (avformat_find_stream_info(input_ctx, NULL) < 0) { > + fprintf(stderr, "Cannot find input stream information.\n"); > + return -1; > + } > + > + /* find the video stream information */ > + ret = av_find_best_stream(input_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, > &decoder, 0); > + if (ret < 0) { > + fprintf(stderr, "Cannot find a video stream in the input file\n"); > + return -1; > + } > + video_stream = ret; > + > + if (!(decoder_ctx = avcodec_alloc_context3(decoder))) > + return AVERROR(ENOMEM); > + > + AVStream *video = input_ctx->streams[video_stream]; > + if (avcodec_parameters_to_context(decoder_ctx, video->codecpar) < 0) > + return -1; > + > + decoder_ctx->get_format = get_hw_format; > + av_opt_set_int(decoder_ctx, "refcounted_frames", 1, 0); > + > + if (hw_decoder_init(decoder_ctx, type) < 0) > + return -1; > + > + if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) { > + fprintf(stderr, "Failed to open codec for stream #%u\n", video_stream); > + return -1; > + } > + > + /* open the file to dump raw data */ > + output_file = fopen(argv[3], "w+"); > + > + /* actual decoding and dump the raw data */ > + while (ret >= 0) { > + if ((ret = av_read_frame(input_ctx, &packet)) < 0) > + break; > + > + if (video_stream == packet.stream_index) > + ret = decode_write(decoder_ctx, &packet); > + > + av_packet_unref(&packet); > + } > + > + /* flush the decoder */ > + packet.data = NULL; > + packet.size = 0; > + ret = decode_write(decoder_ctx, &packet); > + av_packet_unref(&packet); > + > + if (output_file) > + fclose(output_file); > + avcodec_free_context(&decoder_ctx); > + avformat_close_input(&input_ctx); > + av_buffer_unref(&hw_device_ctx); > + > + return 0; > +} >
2017-07-20 15:09 GMT+08:00 Jun Zhao <mypopydev@gmail.com>: > > > On 2017/7/20 14:17, Steven Liu wrote: >> 2017-07-20 13:29 GMT+08:00 Jun Zhao <mypopydev@gmail.com>: >>> V3: re-work to support the other hwaccels, just test with vaapi, dxva2|d3d11va|videotoolbox might work as well. >>> V2: re-work with new hw decoding API. >>> >>> _______________________________________________ >>> ffmpeg-devel mailing list >>> ffmpeg-devel@ffmpeg.org >>> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel >>> >> >> 已打开会话。包含1封未读邮件。 >> >> 跳至内容 >> 通过屏幕阅读器使用 Gmail >> >> 搜索 >> >> Gmail >> 写邮件 >> >> 标签 >> >> 收件箱 (1) >> 已加星标 >> 重要邮件 >> 聊天记录 >> 已发邮件 >> 草稿 >> 所有邮件 >> 垃圾邮件 (27) >> 已删除邮件 >> [Gmail]/Gluster-review (493) >> [Gmail]Gluster-review >> [Imap]/Drafts >> [Imap]/Trash >> 工作邮件 >> 旅行相关 >> 收据 >> 私人邮件 >> arm-linux (2) >> btrfs (25) >> Deleted Messages >> ffmpeg (5,060) >> ffmpeg-devel (16,285) >> glusterfs (945) >> kernel-cn >> libav (2,049) >> Notes >> OpenBSD_ARM >> OpenBSD-announce (1) >> rfc (567) >> Sent Messages >> SMS >> 显示更多标签 >> >> ________________________________ >> >> 环聊 >> >> >> >> >> 删除标签 >> >> >> 更多操作 >> >> 第 1 个会话,共 19,716 个 >> >> >> >> >> [FFmpeg-devel] [PATCH V3] examples/hw_decode: Add a HWAccel decoding example. >> >> ffmpeg-devel >> x >> >> Jun Zhao 通过“ffmpeg.org” >> >> 13:29 (41分钟前) >> 发送至 FFmpeg、 Mark、 wm4、 Kaixuan >> 英语 >> 中文 >> >> 翻译邮件 >> 对英语停用 >> V3: re-work to support the other hwaccels, just test with vaapi, >> dxva2|d3d11va|videotoolbox might work as well. >> V2: re-work with new hw decoding API. >> >> _______________________________________________ >> ffmpeg-devel mailing list >> ffmpeg-devel@ffmpeg.org >> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel >> 附件区域 >> 点击此处即可回复、回复全部或转发 >> 使用了 15 GB 存储空间中的13.16 GB (87%) >> 管理 >> 上次帐号活动时间:1小时前 >> 详细信息 >> 参与者(5 人) >> Zhao Jun >> mypopydev@gmail.com >> 显示详细信息 >> >> From bd8cbd5c16be3001b950f0c4ae3548909a396bc6 Mon Sep 17 00:00:00 2001 >> From: Jun Zhao <jun.zhao@intel.com> >> Date: Thu, 20 Jul 2017 00:58:56 -0400 >> Subject: [PATCH V3] examples/hw_decode: Add a HWAccel decoding example. >> >> Add a HWAccel decoding example. >> >> Just test with vaapi, dxva2|d3d11va|videotoolbox might work as well. >> >> Signed-off-by: Liu, Kaixuan <kaixuan.liu@intel.com> >> Signed-off-by: Jun Zhao <jun.zhao@intel.com> >> --- >> doc/examples/hw_decode.c | 246 +++++++++++++++++++++++++++++++++++++++++++++++ >> 1 file changed, 246 insertions(+) >> create mode 100644 doc/examples/hw_decode.c >> >> diff --git a/doc/examples/hw_decode.c b/doc/examples/hw_decode.c >> new file mode 100644 >> index 0000000000..4070a60cba >> --- /dev/null >> +++ b/doc/examples/hw_decode.c >> @@ -0,0 +1,246 @@ >> +/* >> + * Copyright (c) 2017 Jun Zhao >> + * Copyright (c) 2017 Kaixuan Liu >> + * >> + * HW Acceleration API (video decoding) decode sample >> + * >> + * 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 >> + * HW-Accelerated decoding example. >> + * >> + * @example hw_decode.c >> + * This example shows how to do HW-accelerated decoding with output >> + * frames from the HW video surfaces. >> + */ >> + >> +#include <stdio.h> >> + >> +#include <libavcodec/avcodec.h> >> +#include <libavformat/avformat.h> >> +#include <libavutil/pixdesc.h> >> +#include <libavutil/hwcontext.h> >> +#include <libavutil/opt.h> >> +#include <libavutil/avassert.h> >> +#include <libavutil/imgutils.h> >> + >> +static AVBufferRef *hw_device_ctx = NULL; >> +static enum AVPixelFormat hw_pix_fmt; >> +FILE *output_file = NULL; >> + >> +static enum AVPixelFormat hw_pix_fmts[] = { >> + [AV_HWDEVICE_TYPE_CUDA] = AV_PIX_FMT_CUDA, >> + [AV_HWDEVICE_TYPE_DXVA2] = AV_PIX_FMT_DXVA2_VLD, >> + [AV_HWDEVICE_TYPE_D3D11VA] = AV_PIX_FMT_D3D11VA_VLD, >> + [AV_HWDEVICE_TYPE_QSV] = AV_PIX_FMT_QSV, >> + [AV_HWDEVICE_TYPE_VAAPI] = AV_PIX_FMT_VAAPI, >> + [AV_HWDEVICE_TYPE_VDPAU] = AV_PIX_FMT_VDPAU, >> + [AV_HWDEVICE_TYPE_VIDEOTOOLBOX] = AV_PIX_FMT_VIDEOTOOLBOX, >> +}; >> + >> +static enum AVPixelFormat find_fmt_by_hw_type(const enum AVHWDeviceType type) >> +{ >> + if (type >= 0 && type < FF_ARRAY_ELEMS(hw_pix_fmts)) >> + return hw_pix_fmts[type]; >> + else >> + return AV_PIX_FMT_NONE; >> +} >> + >> +static int hw_decoder_init(AVCodecContext *ctx, const enum AVHWDeviceType type) >> +{ >> + int err = 0; >> + >> + if ((err = av_hwdevice_ctx_create(&hw_device_ctx, type, >> + NULL, NULL, 0)) < 0) { >> + fprintf(stderr, "Failed to create specified HW device.\n"); >> + return err; >> + } >> + ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx); >> + >> + return err; >> +} >> + >> +static enum AVPixelFormat get_hw_format(AVCodecContext *ctx, >> + const enum AVPixelFormat *pix_fmts) >> +{ >> + const enum AVPixelFormat *p; >> + >> + for (p = pix_fmts; *p != -1; p++) { >> + if (*p == hw_pix_fmt) >> + return *p; >> + } >> + >> + fprintf(stderr, "Failed to get HW surface format.\n"); >> + return AV_PIX_FMT_NONE; >> +} >> + >> +static int decode_write(AVCodecContext *avctx, AVPacket *packet) >> +{ >> + AVFrame *frame = NULL, *sw_frame = NULL; >> + AVFrame *tmp_frame = NULL; >> + uint8_t *buffer = NULL; >> + int size; >> + int ret = 0; >> + >> + ret = avcodec_send_packet(avctx, packet); >> + if (ret < 0) { >> + fprintf(stderr, "Error during decoding\n"); >> + return ret; >> + } >> + >> + while (ret >= 0) { >> + if (!(frame = av_frame_alloc()) || !(sw_frame = av_frame_alloc())) >> + return AVERROR(ENOMEM); >> If the frame alloc success and the sw_frame alloc failure, maybe it is memleak? >> or if it is just a sample, that is not the impotant point? >> What about use ret = AVERROR(ENOMEM), goto fail, and add if(frame) >> av_frame_free(&frame); >> if (sw_frame) av_frame_free(&sw_frame); > > Good catch, will use goto handle this case, but I think don't need to check NULL before > call av_frame_free, in the function av_frame_free, have handle with if (!frame || !*frame), > so it doesn't need to check the NULL before call av_frame_free. That's ok. >> >> + >> + ret = avcodec_receive_frame(avctx, frame); >> + if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) >> + break; >> + else if (ret < 0) { >> + fprintf(stderr, "Error while decoding\n"); >> + goto fail; >> + } >> + >> + if (frame->format == hw_pix_fmt) { >> + /* retrieve data from GPU to CPU */ >> + if ((ret = av_hwframe_transfer_data(sw_frame, frame, 0)) < 0) { >> + fprintf(stderr, "Error transferring the data to >> system memory\n"); >> + goto fail; >> + } >> + tmp_frame = sw_frame; >> + } else >> + tmp_frame = frame; >> + >> + size = av_image_get_buffer_size(tmp_frame->format, tmp_frame->width, >> + tmp_frame->height, 1); >> + buffer = av_malloc(size); >> + if (!buffer) { >> + fprintf(stderr, "Can not alloc buffer\n"); >> + ret = AVERROR(ENOMEM); >> + goto fail; >> + } >> + ret = av_image_copy_to_buffer(buffer, size, >> + (const uint8_t * const *)tmp_frame->data, >> + (const int >> *)tmp_frame->linesize, tmp_frame->format, >> + tmp_frame->width, tmp_frame->height, 1); >> + if (ret < 0) { >> + fprintf(stderr, "Can not copy image to buffer\n"); >> + goto fail; >> + } >> + >> + if ((ret = fwrite(buffer, 1, size, output_file)) < 0) { >> + fprintf(stderr, "Failed to dump raw data.\n"); >> + goto fail; >> + } >> + >> + fail: >> + av_frame_free(&frame); >> + av_frame_free(&sw_frame); >> + if (buffer) >> + av_freep(&buffer); >> + if (ret < 0) >> + return ret; >> + } >> + >> + return 0; >> +} >> + >> +int main(int argc, char *argv[]) >> +{ >> + AVFormatContext *input_ctx = NULL; >> + int video_stream, ret; >> + AVCodecContext *decoder_ctx = NULL; >> + AVCodec *decoder = NULL; >> + AVPacket packet; >> + enum AVHWDeviceType type; >> + >> + if (argc < 4) { >> + fprintf(stderr, "Usage: %s <vaapi|dxva2|d3d11va> <input file> >> <output file>\n", argv[0]); >> + return -1; >> + } >> + >> + av_register_all(); >> + >> + type = av_hwdevice_find_type_by_name(argv[1]); >> + hw_pix_fmt = find_fmt_by_hw_type(type); >> + >> + /* open the input file */ >> + if (avformat_open_input(&input_ctx, argv[2], NULL, NULL) != 0) { >> + fprintf(stderr, "Cannot open input file '%s'\n", argv[1]); >> + return -1; >> + } >> + >> + if (avformat_find_stream_info(input_ctx, NULL) < 0) { >> + fprintf(stderr, "Cannot find input stream information.\n"); >> + return -1; >> + } >> + >> + /* find the video stream information */ >> + ret = av_find_best_stream(input_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, >> &decoder, 0); >> + if (ret < 0) { >> + fprintf(stderr, "Cannot find a video stream in the input file\n"); >> + return -1; >> + } >> + video_stream = ret; >> + >> + if (!(decoder_ctx = avcodec_alloc_context3(decoder))) >> + return AVERROR(ENOMEM); >> + >> + AVStream *video = input_ctx->streams[video_stream]; >> + if (avcodec_parameters_to_context(decoder_ctx, video->codecpar) < 0) >> + return -1; >> + >> + decoder_ctx->get_format = get_hw_format; >> + av_opt_set_int(decoder_ctx, "refcounted_frames", 1, 0); >> + >> + if (hw_decoder_init(decoder_ctx, type) < 0) >> + return -1; >> + >> + if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) { >> + fprintf(stderr, "Failed to open codec for stream #%u\n", video_stream); >> + return -1; >> + } >> + >> + /* open the file to dump raw data */ >> + output_file = fopen(argv[3], "w+"); >> + >> + /* actual decoding and dump the raw data */ >> + while (ret >= 0) { >> + if ((ret = av_read_frame(input_ctx, &packet)) < 0) >> + break; >> + >> + if (video_stream == packet.stream_index) >> + ret = decode_write(decoder_ctx, &packet); >> + >> + av_packet_unref(&packet); >> + } >> + >> + /* flush the decoder */ >> + packet.data = NULL; >> + packet.size = 0; >> + ret = decode_write(decoder_ctx, &packet); >> + av_packet_unref(&packet); >> + >> + if (output_file) >> + fclose(output_file); >> + avcodec_free_context(&decoder_ctx); >> + avformat_close_input(&input_ctx); >> + av_buffer_unref(&hw_device_ctx); >> + >> + return 0; >> +} >>
diff --git a/doc/examples/hw_decode.c b/doc/examples/hw_decode.c new file mode 100644 index 0000000000..4070a60cba --- /dev/null +++ b/doc/examples/hw_decode.c @@ -0,0 +1,246 @@ +/* + * Copyright (c) 2017 Jun Zhao + * Copyright (c) 2017 Kaixuan Liu + * + * HW Acceleration API (video decoding) decode sample + * + * 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 + * HW-Accelerated decoding example. + * + * @example hw_decode.c + * This example shows how to do HW-accelerated decoding with output + * frames from the HW video surfaces. + */ + +#include <stdio.h> + +#include <libavcodec/avcodec.h> +#include <libavformat/avformat.h> +#include <libavutil/pixdesc.h> +#include <libavutil/hwcontext.h> +#include <libavutil/opt.h> +#include <libavutil/avassert.h> +#include <libavutil/imgutils.h> + +static AVBufferRef *hw_device_ctx = NULL; +static enum AVPixelFormat hw_pix_fmt; +FILE *output_file = NULL; + +static enum AVPixelFormat hw_pix_fmts[] = { + [AV_HWDEVICE_TYPE_CUDA] = AV_PIX_FMT_CUDA, + [AV_HWDEVICE_TYPE_DXVA2] = AV_PIX_FMT_DXVA2_VLD, + [AV_HWDEVICE_TYPE_D3D11VA] = AV_PIX_FMT_D3D11VA_VLD, + [AV_HWDEVICE_TYPE_QSV] = AV_PIX_FMT_QSV, + [AV_HWDEVICE_TYPE_VAAPI] = AV_PIX_FMT_VAAPI, + [AV_HWDEVICE_TYPE_VDPAU] = AV_PIX_FMT_VDPAU, + [AV_HWDEVICE_TYPE_VIDEOTOOLBOX] = AV_PIX_FMT_VIDEOTOOLBOX, +}; + +static enum AVPixelFormat find_fmt_by_hw_type(const enum AVHWDeviceType type) +{ + if (type >= 0 && type < FF_ARRAY_ELEMS(hw_pix_fmts)) + return hw_pix_fmts[type]; + else + return AV_PIX_FMT_NONE; +} + +static int hw_decoder_init(AVCodecContext *ctx, const enum AVHWDeviceType type) +{ + int err = 0; + + if ((err = av_hwdevice_ctx_create(&hw_device_ctx, type, + NULL, NULL, 0)) < 0) { + fprintf(stderr, "Failed to create specified HW device.\n"); + return err; + } + ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx); + + return err; +} + +static enum AVPixelFormat get_hw_format(AVCodecContext *ctx, + const enum AVPixelFormat *pix_fmts) +{ + const enum AVPixelFormat *p; + + for (p = pix_fmts; *p != -1; p++) { + if (*p == hw_pix_fmt) + return *p; + } + + fprintf(stderr, "Failed to get HW surface format.\n"); + return AV_PIX_FMT_NONE; +} + +static int decode_write(AVCodecContext *avctx, AVPacket *packet) +{ + AVFrame *frame = NULL, *sw_frame = NULL; + AVFrame *tmp_frame = NULL; + uint8_t *buffer = NULL; + int size; + int ret = 0; + + ret = avcodec_send_packet(avctx, packet); + if (ret < 0) { + fprintf(stderr, "Error during decoding\n"); + return ret; + } + + while (ret >= 0) { + if (!(frame = av_frame_alloc()) || !(sw_frame = av_frame_alloc())) + return AVERROR(ENOMEM); If the frame alloc success and the sw_frame alloc failure, maybe it is memleak? or if it is just a sample, that is not the impotant point? What about use ret = AVERROR(ENOMEM), goto fail, and add if(frame) av_frame_free(&frame); if (sw_frame) av_frame_free(&sw_frame); + + ret = avcodec_receive_frame(avctx, frame); + if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) + break; + else if (ret < 0) { + fprintf(stderr, "Error while decoding\n"); + goto fail; + } + + if (frame->format == hw_pix_fmt) { + /* retrieve data from GPU to CPU */ + if ((ret = av_hwframe_transfer_data(sw_frame, frame, 0)) < 0) { + fprintf(stderr, "Error transferring the data to system memory\n"); + goto fail; + } + tmp_frame = sw_frame; + } else + tmp_frame = frame; + + size = av_image_get_buffer_size(tmp_frame->format, tmp_frame->width, + tmp_frame->height, 1); + buffer = av_malloc(size); + if (!buffer) { + fprintf(stderr, "Can not alloc buffer\n"); + ret = AVERROR(ENOMEM); + goto fail; + } + ret = av_image_copy_to_buffer(buffer, size, + (const uint8_t * const *)tmp_frame->data, + (const int *)tmp_frame->linesize, tmp_frame->format, + tmp_frame->width, tmp_frame->height, 1); + if (ret < 0) { + fprintf(stderr, "Can not copy image to buffer\n"); + goto fail; + } + + if ((ret = fwrite(buffer, 1, size, output_file)) < 0) { + fprintf(stderr, "Failed to dump raw data.\n"); + goto fail; + } + + fail: + av_frame_free(&frame); + av_frame_free(&sw_frame); + if (buffer) + av_freep(&buffer); + if (ret < 0) + return ret; + } + + return 0; +} + +int main(int argc, char *argv[]) +{ + AVFormatContext *input_ctx = NULL; + int video_stream, ret; + AVCodecContext *decoder_ctx = NULL; + AVCodec *decoder = NULL; + AVPacket packet; + enum AVHWDeviceType type; + + if (argc < 4) { + fprintf(stderr, "Usage: %s <vaapi|dxva2|d3d11va> <input file> <output file>\n", argv[0]); + return -1; + } + + av_register_all(); + + type = av_hwdevice_find_type_by_name(argv[1]); + hw_pix_fmt = find_fmt_by_hw_type(type); + + /* open the input file */ + if (avformat_open_input(&input_ctx, argv[2], NULL, NULL) != 0) { + fprintf(stderr, "Cannot open input file '%s'\n", argv[1]); + return -1; + } + + if (avformat_find_stream_info(input_ctx, NULL) < 0) { + fprintf(stderr, "Cannot find input stream information.\n"); + return -1; + } + + /* find the video stream information */ + ret = av_find_best_stream(input_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0); + if (ret < 0) { + fprintf(stderr, "Cannot find a video stream in the input file\n"); + return -1; + } + video_stream = ret; + + if (!(decoder_ctx = avcodec_alloc_context3(decoder))) + return AVERROR(ENOMEM); + + AVStream *video = input_ctx->streams[video_stream]; + if (avcodec_parameters_to_context(decoder_ctx, video->codecpar) < 0) + return -1; + + decoder_ctx->get_format = get_hw_format; + av_opt_set_int(decoder_ctx, "refcounted_frames", 1, 0); + + if (hw_decoder_init(decoder_ctx, type) < 0) + return -1; + + if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) { + fprintf(stderr, "Failed to open codec for stream #%u\n", video_stream); + return -1; + } + + /* open the file to dump raw data */ + output_file = fopen(argv[3], "w+"); + + /* actual decoding and dump the raw data */ + while (ret >= 0) { + if ((ret = av_read_frame(input_ctx, &packet)) < 0) + break; + + if (video_stream == packet.stream_index) + ret = decode_write(decoder_ctx, &packet); + + av_packet_unref(&packet); + } + + /* flush the decoder */ + packet.data = NULL; + packet.size = 0; + ret = decode_write(decoder_ctx, &packet);