ffmpeg例子hw_decode.c在硬解码rtsp流的时候会报错,因此做了如下修改:
#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;
static FILE *output_file = NULL;
enum AVHWDeviceType Gtype;
static int hw_decoder_init(AVCodecContext *ctx, const enum AVHWDeviceType type)
{
int err = 0;
if ((err = av_hwdevice_ctx_create(&hw_device_ctx, type, "/dev/dri/renderD128", 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++)
{
const AVCodecHWConfig *config = NULL;
int i;
for (i = 0;; i++)
{
config = avcodec_get_hw_config(ctx->codec, i);
if (!config)
break;
if (!(config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX))
continue;
if (config->pix_fmt == *p)
break;
}
if(config)
{
if(config->device_type != Gtype)
continue;
//int ret;
//ret = hwaccel_decode_init(ctx);
//if (ret < 0)
//{
// continue;
//}
}
return *p;
}
fprintf(stderr, "Failed to get HW surface format 22 .\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 (1) {
if (!(frame = av_frame_alloc()) || !(sw_frame = av_frame_alloc())) {
fprintf(stderr, "Can not alloc frame\n");
ret = AVERROR(ENOMEM);
goto fail;
}
ret = avcodec_receive_frame(avctx, frame);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
av_frame_free(&frame);
av_frame_free(&sw_frame);
return 0;
} else if (ret < 0) {
fprintf(stderr, "Error while decoding\n");
goto fail;
}
printf("decode ok\n");
#if 0
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;
}
#endif
fail:
printf("go to fail\n");
av_frame_free(&frame);
av_frame_free(&sw_frame);
av_freep(&buffer);
if (ret < 0)
return ret;
}
}
#if 0
static enum AVPixelFormat get_format(AVCodecContext *s, const enum AVPixelFormat *pix_fmts)
{
InputStream *ist = s->opaque;
const enum AVPixelFormat *p;
int ret;
for (p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(*p);
const AVCodecHWConfig *config = NULL;
int i;
if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
break;
if (ist->hwaccel_id == HWACCEL_GENERIC ||
ist->hwaccel_id == HWACCEL_AUTO) {
for (i = 0;; i++) {
config = avcodec_get_hw_config(s->codec, i);
if (!config)
break;
if (!(config->methods &
AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX))
continue;
if (config->pix_fmt == *p)
break;
}
}
if (config) {
if (config->device_type != ist->hwaccel_device_type) {
// Different hwaccel offered, ignore.
continue;
}
ret = hwaccel_decode_init(s);
if (ret < 0) {
if (ist->hwaccel_id == HWACCEL_GENERIC) {
av_log(NULL, AV_LOG_FATAL,
"%s hwaccel requested for input stream #%d:%d, "
"but cannot be initialized.\n",
av_hwdevice_get_type_name(config->device_type),
ist->file_index, ist->st->index);
return AV_PIX_FMT_NONE;
}
continue;
}
} else {
const HWAccel *hwaccel = NULL;
int i;
for (i = 0; hwaccels[i].name; i++) {
if (hwaccels[i].pix_fmt == *p) {
hwaccel = &hwaccels[i];
break;
}
}
if (!hwaccel) {
// No hwaccel supporting this pixfmt.
continue;
}
if (hwaccel->id != ist->hwaccel_id) {
// Does not match requested hwaccel.
continue;
}
ret = hwaccel->init(s);
if (ret < 0) {
av_log(NULL, AV_LOG_FATAL,
"%s hwaccel requested for input stream #%d:%d, "
"but cannot be initialized.\n", hwaccel->name,
ist->file_index, ist->st->index);
return AV_PIX_FMT_NONE;
}
}
if (ist->hw_frames_ctx) {
s->hw_frames_ctx = av_buffer_ref(ist->hw_frames_ctx);
if (!s->hw_frames_ctx)
return AV_PIX_FMT_NONE;
}
ist->hwaccel_pix_fmt = *p;
break;
}
return *p;
}
#endif
int main(int argc, char *argv[])
{
AVFormatContext *input_ctx = NULL;
int video_stream, ret;
AVStream *video = NULL;
AVCodecContext *decoder_ctx = NULL;
AVCodec *decoder = NULL;
AVPacket packet;
enum AVHWDeviceType type;
int i;
avdevice_register_all();
avformat_network_init();
if (argc < 4) {
fprintf(stderr, "Usage: %s <device type> <input file> <output file>\n", argv[0]);
return -1;
}
type = av_hwdevice_find_type_by_name("vaapi");
if (type == AV_HWDEVICE_TYPE_NONE)
{
fprintf(stderr, "Device type %s is not supported.\n", "vaapi");
fprintf(stderr, "Available device types:");
while((type = av_hwdevice_iterate_types(type)) != AV_HWDEVICE_TYPE_NONE)
{
fprintf(stderr, " %s", av_hwdevice_get_type_name(type));
}
fprintf(stderr, "\n");
return -1;
}
Gtype = type;
/*初始化dev,为了获取codec ctx
if(hw_device_init_from_type(type, "/dev/dri/renderD128",&dev) < 0)
{
fprintf(stderr, "Device setup failed for decoder on input stream");
return -1;
}*/
/* open the input file */
if (avformat_open_input(&input_ctx, argv[2], NULL, NULL) != 0)
{
fprintf(stderr, "Cannot open input file '%s'\n", argv[2]);
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;
/*for (i = 0;; i++) {
const AVCodecHWConfig *config = avcodec_get_hw_config(decoder, i);
if (!config) {
fprintf(stderr, "Decoder %s does not support device type %s.\n",
decoder->name, av_hwdevice_get_type_name(type));
return -1;
}
if ((config->methods & AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX) &&
(config->device_type == type))
{
hw_pix_fmt = config->pix_fmt;
break;
}
}
printf("hw_pix_fmt=%d\n",hw_pix_fmt);*/
if (!(decoder_ctx = avcodec_alloc_context3(decoder)))
return AVERROR(ENOMEM);
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;
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)
{
printf("read frame err\n");
//break;
}
if (video_stream == packet.stream_index)
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;
}