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Pass the v4l2 buffer into the AVPacket, instead of allocating a new buffer 

and copying the frame into it (remove a memcpy())

Originally committed as revision 7981 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Luca Abeni 2007-02-14 13:25:24 +00:00
parent a492ad9f63
commit 41536a6078
1 changed files with 49 additions and 13 deletions
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62
libavformat/v4l2.c
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@ -59,6 +59,11 @@ struct video_data {
unsigned int *buf_len;
};
struct buff_data {
int index;
int fd;
};
struct fmt_map {
enum PixelFormat ff_fmt;
int32_t v4l2_fmt;
@ -293,10 +298,32 @@ static int read_init(AVFormatContext *ctx)
return -1;
}
static int mmap_read_frame(AVFormatContext *ctx, void *frame, int64_t *ts)
static void mmap_release_buffer(AVPacket *pkt)
{
struct v4l2_buffer buf;
int res, fd;
struct buff_data *buf_descriptor = pkt->priv;
memset(&buf, 0, sizeof(struct v4l2_buffer));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = buf_descriptor->index;
fd = buf_descriptor->fd;
av_free(buf_descriptor);
res = ioctl (fd, VIDIOC_QBUF, &buf);
if (res < 0) {
av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
}
pkt->data = NULL;
pkt->size = 0;
}
static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt)
{
struct video_data *s = ctx->priv_data;
struct v4l2_buffer buf;
struct buff_data *buf_descriptor;
int res;
memset(&buf, 0, sizeof(struct v4l2_buffer));
@ -319,20 +346,28 @@ static int mmap_read_frame(AVFormatContext *ctx, void *frame, int64_t *ts)
}
/* Image is at s->buff_start[buf.index] */
memcpy(frame, s->buf_start[buf.index], buf.bytesused);
*ts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
res = ioctl (s->fd, VIDIOC_QBUF, &buf);
if (res < 0) {
av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n");
pkt->data= s->buf_start[buf.index];
pkt->size = buf.bytesused;
pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec;
pkt->destruct = mmap_release_buffer;
buf_descriptor = av_malloc(sizeof(struct buff_data));
if (buf_descriptor == NULL) {
/* Something went wrong... Since av_malloc() failed, we cannot even
* allocate a buffer for memcopying into it
*/
av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n");
res = ioctl (s->fd, VIDIOC_QBUF, &buf);
return -1;
}
buf_descriptor->fd = s->fd;
buf_descriptor->index = buf.index;
pkt->priv = buf_descriptor;
return s->buf_len[buf.index];
}
static int read_frame(AVFormatContext *ctx, void *frame, int64_t *ts)
static int read_frame(AVFormatContext *ctx, AVPacket *pkt)
{
return -1;
}
@ -500,13 +535,14 @@ static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt)
struct video_data *s = s1->priv_data;
int res;
if (av_new_packet(pkt, s->frame_size) < 0)
return AVERROR_IO;
if (s->io_method == io_mmap) {
res = mmap_read_frame(s1, pkt->data, &pkt->pts);
av_init_packet(pkt);
res = mmap_read_frame(s1, pkt);
} else if (s->io_method == io_read) {
res = read_frame(s1, pkt->data, &pkt->pts);
if (av_new_packet(pkt, s->frame_size) < 0)
return AVERROR_IO;
res = read_frame(s1, pkt);
} else {
return AVERROR_IO;
}