X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavdevice%2Fv4l2.c;h=a2b49c6002b54b35b641ababf35fb80e0176fc42;hb=40cf1bbacc6220a0aa6bed5c331871d43f9ce370;hp=d8d58f06bd81499285ef5f5dbbe6dfa7d32ac204;hpb=3d0d9a5e3bbb7eb0e97b588afe1be73c1fbe9075;p=ffmpeg diff --git a/libavdevice/v4l2.c b/libavdevice/v4l2.c index d8d58f06bd8..a2b49c6002b 100644 --- a/libavdevice/v4l2.c +++ b/libavdevice/v4l2.c @@ -1,203 +1,217 @@ /* * Video4Linux2 grab interface - * Copyright (c) 2000,2001 Fabrice Bellard. - * Copyright (c) 2006 Luca Abeni. + * Copyright (c) 2000,2001 Fabrice Bellard + * Copyright (c) 2006 Luca Abeni * * Part of this file is based on the V4L2 video capture example * (http://v4l2spec.bytesex.org/v4l2spec/capture.c) * * Thanks to Michael Niedermayer for providing the mapping between - * V4L2_PIX_FMT_* and PIX_FMT_* + * V4L2_PIX_FMT_* and AV_PIX_FMT_* * * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav 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, + * Libav 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 + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #undef __STRICT_ANSI__ //workaround due to broken kernel headers #include "config.h" #include "libavformat/avformat.h" +#include "libavformat/internal.h" #include #include #include #include #include -#ifdef HAVE_SYS_VIDEOIO_H +#include +#if HAVE_SYS_VIDEOIO_H #include #else -#include #include #endif -#include -#include +#include "libavutil/atomic.h" +#include "libavutil/avassert.h" +#include "libavutil/imgutils.h" +#include "libavutil/internal.h" +#include "libavutil/log.h" +#include "libavutil/opt.h" +#include "libavutil/parseutils.h" +#include "libavutil/pixdesc.h" +#include "libavutil/avstring.h" +#include "libavutil/mathematics.h" static const int desired_video_buffers = 256; -enum io_method { - io_read, - io_mmap, - io_userptr -}; +#define V4L_ALLFORMATS 3 +#define V4L_RAWFORMATS 1 +#define V4L_COMPFORMATS 2 struct video_data { + AVClass *class; int fd; int frame_format; /* V4L2_PIX_FMT_* */ - enum io_method io_method; int width, height; - int frame_rate; - int frame_rate_base; int frame_size; + int timeout; + int interlaced; int top_field_first; int buffers; + volatile int buffers_queued; void **buf_start; unsigned int *buf_len; + char *standard; + int channel; + char *video_size; /**< String describing video size, + set by a private option. */ + char *pixel_format; /**< Set by a private option. */ + int list_format; /**< Set by a private option. */ + char *framerate; /**< Set by a private option. */ }; struct buff_data { + struct video_data *s; int index; int fd; }; struct fmt_map { - enum PixelFormat ff_fmt; - int32_t v4l2_fmt; + enum AVPixelFormat ff_fmt; + enum AVCodecID codec_id; + uint32_t v4l2_fmt; }; static struct fmt_map fmt_conversion_table[] = { - { - .ff_fmt = PIX_FMT_YUV420P, - .v4l2_fmt = V4L2_PIX_FMT_YUV420, - }, - { - .ff_fmt = PIX_FMT_YUV422P, - .v4l2_fmt = V4L2_PIX_FMT_YUV422P, - }, - { - .ff_fmt = PIX_FMT_YUYV422, - .v4l2_fmt = V4L2_PIX_FMT_YUYV, - }, - { - .ff_fmt = PIX_FMT_UYVY422, - .v4l2_fmt = V4L2_PIX_FMT_UYVY, - }, - { - .ff_fmt = PIX_FMT_YUV411P, - .v4l2_fmt = V4L2_PIX_FMT_YUV411P, - }, - { - .ff_fmt = PIX_FMT_YUV410P, - .v4l2_fmt = V4L2_PIX_FMT_YUV410, - }, - { - .ff_fmt = PIX_FMT_RGB555, - .v4l2_fmt = V4L2_PIX_FMT_RGB555, - }, - { - .ff_fmt = PIX_FMT_RGB565, - .v4l2_fmt = V4L2_PIX_FMT_RGB565, - }, - { - .ff_fmt = PIX_FMT_BGR24, - .v4l2_fmt = V4L2_PIX_FMT_BGR24, - }, - { - .ff_fmt = PIX_FMT_RGB24, - .v4l2_fmt = V4L2_PIX_FMT_RGB24, - }, - { - .ff_fmt = PIX_FMT_BGRA, - .v4l2_fmt = V4L2_PIX_FMT_BGR32, - }, - { - .ff_fmt = PIX_FMT_GRAY8, - .v4l2_fmt = V4L2_PIX_FMT_GREY, - }, + //ff_fmt codec_id v4l2_fmt + { AV_PIX_FMT_YUV420P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV420 }, + { AV_PIX_FMT_YUV422P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV422P }, + { AV_PIX_FMT_YUYV422, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUYV }, + { AV_PIX_FMT_UYVY422, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_UYVY }, + { AV_PIX_FMT_YUV411P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV411P }, + { AV_PIX_FMT_YUV410P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV410 }, + { AV_PIX_FMT_RGB555, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555 }, + { AV_PIX_FMT_RGB565, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565 }, + { AV_PIX_FMT_BGR24, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR24 }, + { AV_PIX_FMT_RGB24, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB24 }, + { AV_PIX_FMT_BGRA, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32 }, + { AV_PIX_FMT_GRAY8, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY }, + { AV_PIX_FMT_NV12, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_NV12 }, + { AV_PIX_FMT_NONE, AV_CODEC_ID_MJPEG, V4L2_PIX_FMT_MJPEG }, + { AV_PIX_FMT_NONE, AV_CODEC_ID_MJPEG, V4L2_PIX_FMT_JPEG }, +#ifdef V4L2_PIX_FMT_H264 + { AV_PIX_FMT_NONE, AV_CODEC_ID_H264, V4L2_PIX_FMT_H264 }, +#endif }; -static int device_open(AVFormatContext *ctx, uint32_t *capabilities) +static int device_open(AVFormatContext *ctx) { struct v4l2_capability cap; int fd; - int res; + int res, err; int flags = O_RDWR; + char errbuf[128]; if (ctx->flags & AVFMT_FLAG_NONBLOCK) { flags |= O_NONBLOCK; } - fd = open(ctx->filename, flags, 0); + + fd = avpriv_open(ctx->filename, flags); if (fd < 0) { + err = AVERROR(errno); + av_strerror(err, errbuf, sizeof(errbuf)); + av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s : %s\n", - ctx->filename, strerror(errno)); + ctx->filename, errbuf); - return -1; + return err; } res = ioctl(fd, VIDIOC_QUERYCAP, &cap); - // ENOIOCTLCMD definition only availble on __KERNEL__ - if (res < 0 && errno == 515) - { - av_log(ctx, AV_LOG_ERROR, "QUERYCAP not implemented, probably V4L device but not supporting V4L2\n"); - close(fd); - - return -1; - } if (res < 0) { + err = AVERROR(errno); + av_strerror(err, errbuf, sizeof(errbuf)); av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", - strerror(errno)); - close(fd); + errbuf); + + goto fail; + } + + av_log(ctx, AV_LOG_VERBOSE, "[%d]Capabilities: %x\n", + fd, cap.capabilities); - return -1; + if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) { + av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n"); + err = AVERROR(ENODEV); + + goto fail; } - if ((cap.capabilities & V4L2_CAP_VIDEO_CAPTURE) == 0) { - av_log(ctx, AV_LOG_ERROR, "Not a video capture device\n"); - close(fd); - return -1; + if (!(cap.capabilities & V4L2_CAP_STREAMING)) { + av_log(ctx, AV_LOG_ERROR, + "The device does not support the streaming I/O method.\n"); + err = AVERROR(ENOSYS); + + goto fail; } - *capabilities = cap.capabilities; return fd; + +fail: + close(fd); + return err; } -static int device_init(AVFormatContext *ctx, int *width, int *height, int pix_fmt) +static int device_init(AVFormatContext *ctx, int *width, int *height, + uint32_t pix_fmt) { struct video_data *s = ctx->priv_data; int fd = s->fd; - struct v4l2_format fmt; + struct v4l2_format fmt = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE }; + struct v4l2_pix_format *pix = &fmt.fmt.pix; + int res; - memset(&fmt, 0, sizeof(struct v4l2_format)); - fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - fmt.fmt.pix.width = *width; - fmt.fmt.pix.height = *height; - fmt.fmt.pix.pixelformat = pix_fmt; - fmt.fmt.pix.field = V4L2_FIELD_INTERLACED; + pix->width = *width; + pix->height = *height; + pix->pixelformat = pix_fmt; + pix->field = V4L2_FIELD_ANY; + res = ioctl(fd, VIDIOC_S_FMT, &fmt); + if ((*width != fmt.fmt.pix.width) || (*height != fmt.fmt.pix.height)) { - av_log(ctx, AV_LOG_INFO, "The V4L2 driver changed the video from %dx%d to %dx%d\n", *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height); + av_log(ctx, AV_LOG_INFO, + "The V4L2 driver changed the video from %dx%d to %dx%d\n", + *width, *height, fmt.fmt.pix.width, fmt.fmt.pix.height); *width = fmt.fmt.pix.width; *height = fmt.fmt.pix.height; } if (pix_fmt != fmt.fmt.pix.pixelformat) { - av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver changed the pixel format from 0x%08X to 0x%08X\n", pix_fmt, fmt.fmt.pix.pixelformat); + av_log(ctx, AV_LOG_DEBUG, + "The V4L2 driver changed the pixel format " + "from 0x%08X to 0x%08X\n", + pix_fmt, fmt.fmt.pix.pixelformat); res = -1; } + if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) { + av_log(ctx, AV_LOG_DEBUG, "The V4L2 driver using the interlaced mode"); + s->interlaced = 1; + } + return res; } @@ -217,12 +231,15 @@ static int first_field(int fd) return 1; } -static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt) +static uint32_t fmt_ff2v4l(enum AVPixelFormat pix_fmt, enum AVCodecID codec_id) { int i; - for (i = 0; i < sizeof(fmt_conversion_table) / sizeof(struct fmt_map); i++) { - if (fmt_conversion_table[i].ff_fmt == pix_fmt) { + for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) { + if ((codec_id == AV_CODEC_ID_NONE || + fmt_conversion_table[i].codec_id == codec_id) && + (pix_fmt == AV_PIX_FMT_NONE || + fmt_conversion_table[i].ff_fmt == pix_fmt)) { return fmt_conversion_table[i].v4l2_fmt; } } @@ -230,203 +247,350 @@ static uint32_t fmt_ff2v4l(enum PixelFormat pix_fmt) return 0; } -static enum PixelFormat fmt_v4l2ff(uint32_t pix_fmt) +static enum AVPixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum AVCodecID codec_id) { int i; - for (i = 0; i < sizeof(fmt_conversion_table) / sizeof(struct fmt_map); i++) { - if (fmt_conversion_table[i].v4l2_fmt == pix_fmt) { + for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) { + if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt && + fmt_conversion_table[i].codec_id == codec_id) { return fmt_conversion_table[i].ff_fmt; } } - return PIX_FMT_NONE; + return AV_PIX_FMT_NONE; +} + +static enum AVCodecID fmt_v4l2codec(uint32_t v4l2_fmt) +{ + int i; + + for (i = 0; i < FF_ARRAY_ELEMS(fmt_conversion_table); i++) { + if (fmt_conversion_table[i].v4l2_fmt == v4l2_fmt) { + return fmt_conversion_table[i].codec_id; + } + } + + return AV_CODEC_ID_NONE; +} + +#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE +static void list_framesizes(AVFormatContext *ctx, int fd, uint32_t pixelformat) +{ + struct v4l2_frmsizeenum vfse = { .pixel_format = pixelformat }; + + while(!ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &vfse)) { + switch (vfse.type) { + case V4L2_FRMSIZE_TYPE_DISCRETE: + av_log(ctx, AV_LOG_INFO, " %ux%u", + vfse.discrete.width, vfse.discrete.height); + break; + case V4L2_FRMSIZE_TYPE_CONTINUOUS: + case V4L2_FRMSIZE_TYPE_STEPWISE: + av_log(ctx, AV_LOG_INFO, " {%u-%u, %u}x{%u-%u, %u}", + vfse.stepwise.min_width, + vfse.stepwise.max_width, + vfse.stepwise.step_width, + vfse.stepwise.min_height, + vfse.stepwise.max_height, + vfse.stepwise.step_height); + } + vfse.index++; + } +} +#endif + +static void list_formats(AVFormatContext *ctx, int fd, int type) +{ + struct v4l2_fmtdesc vfd = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE }; + + while(!ioctl(fd, VIDIOC_ENUM_FMT, &vfd)) { + enum AVCodecID codec_id = fmt_v4l2codec(vfd.pixelformat); + enum AVPixelFormat pix_fmt = fmt_v4l2ff(vfd.pixelformat, codec_id); + + vfd.index++; + + if (!(vfd.flags & V4L2_FMT_FLAG_COMPRESSED) && + type & V4L_RAWFORMATS) { + const char *fmt_name = av_get_pix_fmt_name(pix_fmt); + av_log(ctx, AV_LOG_INFO, "R : %9s : %20s :", + fmt_name ? fmt_name : "Unsupported", + vfd.description); + } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED && + type & V4L_COMPFORMATS) { + const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id); + av_log(ctx, AV_LOG_INFO, "C : %9s : %20s :", + desc ? desc->name : "Unsupported", + vfd.description); + } else { + continue; + } + +#ifdef V4L2_FMT_FLAG_EMULATED + if (vfd.flags & V4L2_FMT_FLAG_EMULATED) { + av_log(ctx, AV_LOG_WARNING, "%s", "Emulated"); + continue; + } +#endif +#if HAVE_STRUCT_V4L2_FRMIVALENUM_DISCRETE + list_framesizes(ctx, fd, vfd.pixelformat); +#endif + av_log(ctx, AV_LOG_INFO, "\n"); + } } static int mmap_init(AVFormatContext *ctx) { - struct video_data *s = ctx->priv_data; - struct v4l2_requestbuffers req; int i, res; + struct video_data *s = ctx->priv_data; + struct v4l2_requestbuffers req = { + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, + .count = desired_video_buffers, + .memory = V4L2_MEMORY_MMAP + }; - memset(&req, 0, sizeof(struct v4l2_requestbuffers)); - req.count = desired_video_buffers; - req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - req.memory = V4L2_MEMORY_MMAP; - res = ioctl (s->fd, VIDIOC_REQBUFS, &req); + res = ioctl(s->fd, VIDIOC_REQBUFS, &req); if (res < 0) { - if (errno == EINVAL) { + res = AVERROR(errno); + if (res == AVERROR(EINVAL)) { av_log(ctx, AV_LOG_ERROR, "Device does not support mmap\n"); } else { av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS)\n"); } - return -1; + return res; } if (req.count < 2) { av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n"); - return -1; + return AVERROR(ENOMEM); } s->buffers = req.count; s->buf_start = av_malloc(sizeof(void *) * s->buffers); - if (s->buf_start == NULL) { + if (!s->buf_start) { av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n"); - return -1; + return AVERROR(ENOMEM); } s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers); - if (s->buf_len == NULL) { + if (!s->buf_len) { av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n"); av_free(s->buf_start); - return -1; + return AVERROR(ENOMEM); } for (i = 0; i < req.count; i++) { - struct v4l2_buffer buf; + struct v4l2_buffer buf = { + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, + .index = i, + .memory = V4L2_MEMORY_MMAP + }; - memset(&buf, 0, sizeof(struct v4l2_buffer)); - buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - buf.memory = V4L2_MEMORY_MMAP; - buf.index = i; - res = ioctl (s->fd, VIDIOC_QUERYBUF, &buf); + res = ioctl(s->fd, VIDIOC_QUERYBUF, &buf); if (res < 0) { + res = AVERROR(errno); av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF)\n"); - return -1; + return res; } s->buf_len[i] = buf.length; - if (s->buf_len[i] < s->frame_size) { - av_log(ctx, AV_LOG_ERROR, "Buffer len [%d] = %d != %d\n", i, s->buf_len[i], s->frame_size); + if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) { + av_log(ctx, AV_LOG_ERROR, + "Buffer len [%d] = %d != %d\n", + i, s->buf_len[i], s->frame_size); return -1; } - s->buf_start[i] = mmap (NULL, buf.length, - PROT_READ | PROT_WRITE, MAP_SHARED, s->fd, buf.m.offset); + s->buf_start[i] = mmap(NULL, buf.length, + PROT_READ | PROT_WRITE, MAP_SHARED, + s->fd, buf.m.offset); + if (s->buf_start[i] == MAP_FAILED) { - av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", strerror(errno)); + char errbuf[128]; + res = AVERROR(errno); + av_strerror(res, errbuf, sizeof(errbuf)); + av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", errbuf); - return -1; + return res; } } return 0; } -static int read_init(AVFormatContext *ctx) +#if FF_API_DESTRUCT_PACKET +static void dummy_release_buffer(AVPacket *pkt) { - return -1; + av_assert0(0); } +#endif -static void mmap_release_buffer(AVPacket *pkt) +static void mmap_release_buffer(void *opaque, uint8_t *data) { - struct v4l2_buffer buf; + struct v4l2_buffer buf = { 0 }; int res, fd; - struct buff_data *buf_descriptor = pkt->priv; + struct buff_data *buf_descriptor = opaque; + struct video_data *s = buf_descriptor->s; + char errbuf[128]; - 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); + res = ioctl(fd, VIDIOC_QBUF, &buf); if (res < 0) { - av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n"); + av_strerror(AVERROR(errno), errbuf, sizeof(errbuf)); + av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", + errbuf); } - pkt->data = NULL; - pkt->size = 0; + avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1); } 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; + struct v4l2_buffer buf = { + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, + .memory = V4L2_MEMORY_MMAP + }; + struct pollfd p = { .fd = s->fd, .events = POLLIN }; int res; - memset(&buf, 0, sizeof(struct v4l2_buffer)); - buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - buf.memory = V4L2_MEMORY_MMAP; + res = poll(&p, 1, s->timeout); + if (res < 0) + return AVERROR(errno); + + if (!(p.revents & (POLLIN | POLLERR | POLLHUP))) + return AVERROR(EAGAIN); /* FIXME: Some special treatment might be needed in case of loss of signal... */ while ((res = ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR)); if (res < 0) { + char errbuf[128]; if (errno == EAGAIN) { pkt->size = 0; return AVERROR(EAGAIN); } - av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", strerror(errno)); + res = AVERROR(errno); + av_strerror(res, errbuf, sizeof(errbuf)); + av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", + errbuf); + + return res; + } - return -1; + if (buf.index >= s->buffers) { + av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n"); + return AVERROR(EINVAL); } - assert (buf.index < s->buffers); - if (buf.bytesused != s->frame_size) { - av_log(ctx, AV_LOG_ERROR, "The v4l2 frame is %d bytes, but %d bytes are expected\n", buf.bytesused, s->frame_size); + avpriv_atomic_int_add_and_fetch(&s->buffers_queued, -1); + // always keep at least one buffer queued + av_assert0(avpriv_atomic_int_get(&s->buffers_queued) >= 1); - return -1; + if (s->frame_size > 0 && buf.bytesused != s->frame_size) { + av_log(ctx, AV_LOG_ERROR, + "The v4l2 frame is %d bytes, but %d bytes are expected\n", + buf.bytesused, s->frame_size); + + return AVERROR_INVALIDDATA; } /* Image is at s->buff_start[buf.index] */ - 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); + if (avpriv_atomic_int_get(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) { + /* when we start getting low on queued buffers, fall back on copying data */ + res = av_new_packet(pkt, buf.bytesused); + if (res < 0) { + av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n"); + return res; + } + memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused); + + res = ioctl(s->fd, VIDIOC_QBUF, &buf); + if (res < 0) { + res = AVERROR(errno); + av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF)\n"); + av_free_packet(pkt); + return res; + } + avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1); + } else { + struct buff_data *buf_descriptor; + + pkt->data = s->buf_start[buf.index]; + pkt->size = buf.bytesused; +#if FF_API_DESTRUCT_PACKET +FF_DISABLE_DEPRECATION_WARNINGS + pkt->destruct = dummy_release_buffer; +FF_ENABLE_DEPRECATION_WARNINGS +#endif + + buf_descriptor = av_malloc(sizeof(struct buff_data)); + if (!buf_descriptor) { + /* Something went wrong... Since av_malloc() failed, we cannot even + * allocate a buffer for memcpying into it + */ + av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n"); + res = ioctl(s->fd, VIDIOC_QBUF, &buf); - return -1; + return AVERROR(ENOMEM); + } + buf_descriptor->fd = s->fd; + buf_descriptor->index = buf.index; + buf_descriptor->s = s; + + pkt->buf = av_buffer_create(pkt->data, pkt->size, mmap_release_buffer, + buf_descriptor, 0); + if (!pkt->buf) { + av_freep(&buf_descriptor); + return AVERROR(ENOMEM); + } } - buf_descriptor->fd = s->fd; - buf_descriptor->index = buf.index; - pkt->priv = buf_descriptor; + pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec; return s->buf_len[buf.index]; } -static int read_frame(AVFormatContext *ctx, AVPacket *pkt) -{ - return -1; -} - static int mmap_start(AVFormatContext *ctx) { struct video_data *s = ctx->priv_data; enum v4l2_buf_type type; - int i, res; + int i, res, err; + char errbuf[128]; for (i = 0; i < s->buffers; i++) { - struct v4l2_buffer buf; + struct v4l2_buffer buf = { + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, + .index = i, + .memory = V4L2_MEMORY_MMAP + }; - memset(&buf, 0, sizeof(struct v4l2_buffer)); - buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - buf.memory = V4L2_MEMORY_MMAP; - buf.index = i; - - res = ioctl (s->fd, VIDIOC_QBUF, &buf); + res = ioctl(s->fd, VIDIOC_QBUF, &buf); if (res < 0) { - av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", strerror(errno)); + err = AVERROR(errno); + av_strerror(err, errbuf, sizeof(errbuf)); + av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", + errbuf); - return -1; + return err; } } + s->buffers_queued = s->buffers; type = V4L2_BUF_TYPE_VIDEO_CAPTURE; - res = ioctl (s->fd, VIDIOC_STREAMON, &type); + res = ioctl(s->fd, VIDIOC_STREAMON, &type); if (res < 0) { - av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", strerror(errno)); + err = AVERROR(errno); + av_strerror(err, errbuf, sizeof(errbuf)); + av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", + errbuf); - return -1; + return err; } return 0; @@ -449,162 +613,252 @@ static void mmap_close(struct video_data *s) av_free(s->buf_len); } -static int v4l2_set_parameters( AVFormatContext *s1, AVFormatParameters *ap ) +static int v4l2_set_parameters(AVFormatContext *s1) { struct video_data *s = s1->priv_data; - struct v4l2_input input; - struct v4l2_standard standard; - int i; - - if(ap->channel>=0) { - /* set tv video input */ - memset (&input, 0, sizeof (input)); - input.index = ap->channel; - if(ioctl (s->fd, VIDIOC_ENUMINPUT, &input) < 0) { - av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n"); - return AVERROR(EIO); - } + struct v4l2_input input = { 0 }; + struct v4l2_standard standard = { 0 }; + struct v4l2_streamparm streamparm = { 0 }; + struct v4l2_fract *tpf = &streamparm.parm.capture.timeperframe; + AVRational framerate_q = { 0 }; + int i, ret; + + streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + + if (s->framerate && + (ret = av_parse_video_rate(&framerate_q, s->framerate)) < 0) { + av_log(s1, AV_LOG_ERROR, "Could not parse framerate '%s'.\n", + s->framerate); + return ret; + } + + /* set tv video input */ + input.index = s->channel; + if (ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) { + av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl enum input failed:\n"); + return AVERROR(EIO); + } - av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n", - ap->channel, input.name); - if(ioctl (s->fd, VIDIOC_S_INPUT, &input.index) < 0 ) { - av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set input(%d) failed\n", - ap->channel); - return AVERROR(EIO); - } + av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set input_id: %d, input: %s\n", + s->channel, input.name); + if (ioctl(s->fd, VIDIOC_S_INPUT, &input.index) < 0) { + av_log(s1, AV_LOG_ERROR, + "The V4L2 driver ioctl set input(%d) failed\n", + s->channel); + return AVERROR(EIO); } - if(ap->standard) { + if (s->standard) { av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s\n", - ap->standard ); + s->standard); /* set tv standard */ - memset (&standard, 0, sizeof (standard)); for(i=0;;i++) { standard.index = i; if (ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) { - av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n", - ap->standard); + av_log(s1, AV_LOG_ERROR, + "The V4L2 driver ioctl set standard(%s) failed\n", + s->standard); return AVERROR(EIO); } - if(!strcasecmp(standard.name, ap->standard)) { + if (!av_strcasecmp(standard.name, s->standard)) { break; } } - av_log(s1, AV_LOG_DEBUG, "The V4L2 driver set standard: %s, id: %"PRIu64"\n", - ap->standard, standard.id); + av_log(s1, AV_LOG_DEBUG, + "The V4L2 driver set standard: %s, id: %"PRIu64"\n", + s->standard, (uint64_t)standard.id); if (ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) { - av_log(s1, AV_LOG_ERROR, "The V4L2 driver ioctl set standard(%s) failed\n", - ap->standard); + av_log(s1, AV_LOG_ERROR, + "The V4L2 driver ioctl set standard(%s) failed\n", + s->standard); return AVERROR(EIO); } } + if (framerate_q.num && framerate_q.den) { + av_log(s1, AV_LOG_DEBUG, "Setting time per frame to %d/%d\n", + framerate_q.den, framerate_q.num); + tpf->numerator = framerate_q.den; + tpf->denominator = framerate_q.num; + + if (ioctl(s->fd, VIDIOC_S_PARM, &streamparm) != 0) { + av_log(s1, AV_LOG_ERROR, + "ioctl set time per frame(%d/%d) failed\n", + framerate_q.den, framerate_q.num); + return AVERROR(EIO); + } + + if (framerate_q.num != tpf->denominator || + framerate_q.den != tpf->numerator) { + av_log(s1, AV_LOG_INFO, + "The driver changed the time per frame from " + "%d/%d to %d/%d\n", + framerate_q.den, framerate_q.num, + tpf->numerator, tpf->denominator); + } + } else { + if (ioctl(s->fd, VIDIOC_G_PARM, &streamparm) != 0) { + char errbuf[128]; + ret = AVERROR(errno); + av_strerror(ret, errbuf, sizeof(errbuf)); + av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n", + errbuf); + return ret; + } + } + s1->streams[0]->avg_frame_rate.num = tpf->denominator; + s1->streams[0]->avg_frame_rate.den = tpf->numerator; + + s->timeout = 100 + + av_rescale_q(1, s1->streams[0]->avg_frame_rate, + (AVRational){1, 1000}); + return 0; } -static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap) +static uint32_t device_try_init(AVFormatContext *s1, + enum AVPixelFormat pix_fmt, + int *width, + int *height, + enum AVCodecID *codec_id) { - struct video_data *s = s1->priv_data; - AVStream *st; - int width, height; - int res, frame_rate, frame_rate_base; - uint32_t desired_format, capabilities; - - if (ap->width <= 0 || ap->height <= 0) { - av_log(s1, AV_LOG_ERROR, "Wrong size (%dx%d)\n", ap->width, ap->height); - return -1; + uint32_t desired_format = fmt_ff2v4l(pix_fmt, s1->video_codec_id); + + if (desired_format == 0 || + device_init(s1, width, height, desired_format) < 0) { + int i; + + desired_format = 0; + for (i = 0; ivideo_codec_id == AV_CODEC_ID_NONE || + fmt_conversion_table[i].codec_id == s1->video_codec_id) { + desired_format = fmt_conversion_table[i].v4l2_fmt; + if (device_init(s1, width, height, desired_format) >= 0) { + break; + } + desired_format = 0; + } + } } - if (ap->time_base.den <= 0) { - av_log(s1, AV_LOG_ERROR, "Wrong time base (%d)\n", ap->time_base.den); - return -1; + + if (desired_format != 0) { + *codec_id = fmt_v4l2codec(desired_format); + assert(*codec_id != AV_CODEC_ID_NONE); } - width = ap->width; - height = ap->height; - frame_rate = ap->time_base.den; - frame_rate_base = ap->time_base.num; + return desired_format; +} - if((unsigned)width > 32767 || (unsigned)height > 32767) { - av_log(s1, AV_LOG_ERROR, "Wrong size (%dx%d)\n", width, height); +static int v4l2_read_header(AVFormatContext *s1) +{ + struct video_data *s = s1->priv_data; + AVStream *st; + int res = 0; + uint32_t desired_format; + enum AVCodecID codec_id; + enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE; + + st = avformat_new_stream(s1, NULL); + if (!st) + return AVERROR(ENOMEM); + + s->fd = device_open(s1); + if (s->fd < 0) + return s->fd; - return -1; + if (s->list_format) { + list_formats(s1, s->fd, s->list_format); + return AVERROR_EXIT; } - st = av_new_stream(s1, 0); - if (!st) { - return AVERROR(ENOMEM); + avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ + + if (s->video_size && + (res = av_parse_video_size(&s->width, &s->height, s->video_size)) < 0) { + av_log(s1, AV_LOG_ERROR, "Could not parse video size '%s'.\n", + s->video_size); + return res; } - av_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ - s->width = width; - s->height = height; - s->frame_rate = frame_rate; - s->frame_rate_base = frame_rate_base; + if (s->pixel_format) { + AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format); - capabilities = 0; - s->fd = device_open(s1, &capabilities); - if (s->fd < 0) { - return AVERROR(EIO); + if (codec) { + s1->video_codec_id = codec->id; + st->need_parsing = AVSTREAM_PARSE_HEADERS; + } + + pix_fmt = av_get_pix_fmt(s->pixel_format); + + if (pix_fmt == AV_PIX_FMT_NONE && !codec) { + av_log(s1, AV_LOG_ERROR, "No such input format: %s.\n", + s->pixel_format); + + return AVERROR(EINVAL); + } } - av_log(s1, AV_LOG_INFO, "[%d]Capabilities: %x\n", s->fd, capabilities); - desired_format = fmt_ff2v4l(ap->pix_fmt); - if (desired_format == 0 || (device_init(s1, &width, &height, desired_format) < 0)) { - int i, done; + if (!s->width && !s->height) { + struct v4l2_format fmt; - done = 0; i = 0; - while (!done) { - desired_format = fmt_conversion_table[i].v4l2_fmt; - if (device_init(s1, &width, &height, desired_format) < 0) { - desired_format = 0; - i++; - } else { - done = 1; - } - if (i == sizeof(fmt_conversion_table) / sizeof(struct fmt_map)) { - done = 1; - } + av_log(s1, AV_LOG_VERBOSE, + "Querying the device for the current frame size\n"); + fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) { + char errbuf[128]; + res = AVERROR(errno); + av_strerror(res, errbuf, sizeof(errbuf)); + av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", + errbuf); + return res; } + + s->width = fmt.fmt.pix.width; + s->height = fmt.fmt.pix.height; + av_log(s1, AV_LOG_VERBOSE, + "Setting frame size to %dx%d\n", s->width, s->height); } + + desired_format = device_try_init(s1, pix_fmt, &s->width, &s->height, + &codec_id); if (desired_format == 0) { - av_log(s1, AV_LOG_ERROR, "Cannot find a proper format.\n"); + av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for " + "codec_id %d, pix_fmt %d.\n", s1->video_codec_id, pix_fmt); close(s->fd); return AVERROR(EIO); } + + if ((res = av_image_check_size(s->width, s->height, 0, s1) < 0)) + return res; + s->frame_format = desired_format; - if( v4l2_set_parameters( s1, ap ) < 0 ) - return AVERROR(EIO); + if ((res = v4l2_set_parameters(s1) < 0)) + return res; - st->codec->pix_fmt = fmt_v4l2ff(desired_format); - s->frame_size = avpicture_get_size(st->codec->pix_fmt, width, height); - if (capabilities & V4L2_CAP_STREAMING) { - s->io_method = io_mmap; - res = mmap_init(s1); - if (res == 0) { - res = mmap_start(s1); - } - } else { - s->io_method = io_read; - res = read_init(s1); - } - if (res < 0) { - close(s->fd); + st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id); + s->frame_size = + avpicture_get_size(st->codec->pix_fmt, s->width, s->height); - return AVERROR(EIO); + if ((res = mmap_init(s1)) || + (res = mmap_start(s1)) < 0) { + close(s->fd); + return res; } + s->top_field_first = first_field(s->fd); - st->codec->codec_type = CODEC_TYPE_VIDEO; - st->codec->codec_id = CODEC_ID_RAWVIDEO; - st->codec->width = width; - st->codec->height = height; - st->codec->time_base.den = frame_rate; - st->codec->time_base.num = frame_rate_base; - st->codec->bit_rate = s->frame_size * 1/av_q2d(st->codec->time_base) * 8; + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; + st->codec->codec_id = codec_id; + if (codec_id == AV_CODEC_ID_RAWVIDEO) + st->codec->codec_tag = + avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt); + st->codec->width = s->width; + st->codec->height = s->height; + st->codec->bit_rate = s->frame_size * av_q2d(st->avg_frame_rate) * 8; return 0; } @@ -612,50 +866,74 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap) static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt) { struct video_data *s = s1->priv_data; +#if FF_API_CODED_FRAME +FF_DISABLE_DEPRECATION_WARNINGS + AVFrame *frame = s1->streams[0]->codec->coded_frame; +FF_ENABLE_DEPRECATION_WARNINGS +#endif int res; - if (s->io_method == io_mmap) { - av_init_packet(pkt); - res = mmap_read_frame(s1, pkt); - } else if (s->io_method == io_read) { - if (av_new_packet(pkt, s->frame_size) < 0) - return AVERROR(EIO); - - res = read_frame(s1, pkt); - } else { - return AVERROR(EIO); - } - if (res < 0) { + av_init_packet(pkt); + if ((res = mmap_read_frame(s1, pkt)) < 0) { return res; } - if (s1->streams[0]->codec->coded_frame) { - s1->streams[0]->codec->coded_frame->interlaced_frame = 1; - s1->streams[0]->codec->coded_frame->top_field_first = s->top_field_first; +#if FF_API_CODED_FRAME +FF_DISABLE_DEPRECATION_WARNINGS + if (frame && s->interlaced) { + frame->interlaced_frame = 1; + frame->top_field_first = s->top_field_first; } +FF_ENABLE_DEPRECATION_WARNINGS +#endif - return s->frame_size; + return pkt->size; } static int v4l2_read_close(AVFormatContext *s1) { struct video_data *s = s1->priv_data; - if (s->io_method == io_mmap) { - mmap_close(s); - } + if (avpriv_atomic_int_get(&s->buffers_queued) != s->buffers) + av_log(s1, AV_LOG_WARNING, "Some buffers are still owned by the caller on " + "close.\n"); + + mmap_close(s); close(s->fd); return 0; } -AVInputFormat v4l2_demuxer = { - "video4linux2", - NULL_IF_CONFIG_SMALL("video grab"), - sizeof(struct video_data), - NULL, - v4l2_read_header, - v4l2_read_packet, - v4l2_read_close, - .flags = AVFMT_NOFILE, +#define OFFSET(x) offsetof(struct video_data, x) +#define DEC AV_OPT_FLAG_DECODING_PARAM +static const AVOption options[] = { + { "standard", "TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC }, + { "channel", "TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC }, + { "video_size", "A string describing frame size, such as 640x480 or hd720.", OFFSET(video_size), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, + { "pixel_format", "Preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, + { "input_format", "Preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, + { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, + { "list_formats", "List available formats and exit", OFFSET(list_format), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC, "list_formats" }, + { "all", "Show all available formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_ALLFORMATS }, 0, INT_MAX, DEC, "list_formats" }, + { "raw", "Show only non-compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_RAWFORMATS }, 0, INT_MAX, DEC, "list_formats" }, + { "compressed", "Show only compressed formats", OFFSET(list_format), AV_OPT_TYPE_CONST, {.i64 = V4L_COMPFORMATS }, 0, INT_MAX, DEC, "list_formats" }, + { NULL }, +}; + +static const AVClass v4l2_class = { + .class_name = "V4L2 indev", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +AVInputFormat ff_v4l2_demuxer = { + .name = "video4linux2", + .long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 device grab"), + .priv_data_size = sizeof(struct video_data), + .read_header = v4l2_read_header, + .read_packet = v4l2_read_packet, + .read_close = v4l2_read_close, + .flags = AVFMT_NOFILE, + .priv_class = &v4l2_class, };