diff options
Diffstat (limited to 'ffmpeg/libavdevice/v4l2.c')
| -rw-r--r-- | ffmpeg/libavdevice/v4l2.c | 1087 |
1 files changed, 1087 insertions, 0 deletions
diff --git a/ffmpeg/libavdevice/v4l2.c b/ffmpeg/libavdevice/v4l2.c new file mode 100644 index 0000000..2d7773a --- /dev/null +++ b/ffmpeg/libavdevice/v4l2.c @@ -0,0 +1,1087 @@ +/* + * Copyright (c) 2000,2001 Fabrice Bellard + * Copyright (c) 2006 Luca Abeni + * + * 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 + * Video4Linux2 grab interface + * + * Part of this file is based on the V4L2 video capture example + * (http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html) + * + * Thanks to Michael Niedermayer for providing the mapping between + * V4L2_PIX_FMT_* and AV_PIX_FMT_* + */ + +#undef __STRICT_ANSI__ //workaround due to broken kernel headers +#include "config.h" +#include "libavformat/internal.h" +#include <unistd.h> +#include <fcntl.h> +#include <sys/ioctl.h> +#include <sys/mman.h> +#include <sys/time.h> +#if HAVE_SYS_VIDEOIO_H +#include <sys/videoio.h> +#else +#if HAVE_ASM_TYPES_H +#include <asm/types.h> +#endif +#include <linux/videodev2.h> +#endif +#include "libavutil/atomic.h" +#include "libavutil/avassert.h" +#include "libavutil/imgutils.h" +#include "libavutil/log.h" +#include "libavutil/opt.h" +#include "avdevice.h" +#include "timefilter.h" +#include "libavutil/parseutils.h" +#include "libavutil/pixdesc.h" +#include "libavutil/time.h" +#include "libavutil/avstring.h" + +#if CONFIG_LIBV4L2 +#include <libv4l2.h> +#else +#define v4l2_open open +#define v4l2_close close +#define v4l2_dup dup +#define v4l2_ioctl ioctl +#define v4l2_read read +#define v4l2_mmap mmap +#define v4l2_munmap munmap +#endif + +static const int desired_video_buffers = 256; + +#define V4L_ALLFORMATS 3 +#define V4L_RAWFORMATS 1 +#define V4L_COMPFORMATS 2 + +/** + * Return timestamps to the user exactly as returned by the kernel + */ +#define V4L_TS_DEFAULT 0 +/** + * Autodetect the kind of timestamps returned by the kernel and convert to + * absolute (wall clock) timestamps. + */ +#define V4L_TS_ABS 1 +/** + * Assume kernel timestamps are from the monotonic clock and convert to + * absolute timestamps. + */ +#define V4L_TS_MONO2ABS 2 + +/** + * Once the kind of timestamps returned by the kernel have been detected, + * the value of the timefilter (NULL or not) determines whether a conversion + * takes place. + */ +#define V4L_TS_CONVERT_READY V4L_TS_DEFAULT + +struct video_data { + AVClass *class; + int fd; + int frame_format; /* V4L2_PIX_FMT_* */ + int width, height; + int frame_size; + int interlaced; + int top_field_first; + int ts_mode; + TimeFilter *timefilter; + int64_t last_time_m; + + int buffers; + volatile int buffers_queued; + void **buf_start; + unsigned int *buf_len; + char *standard; + v4l2_std_id std_id; + int channel; + char *pixel_format; /**< Set by a private option. */ + int list_format; /**< Set by a private option. */ + int list_standard; /**< Set by a private option. */ + char *framerate; /**< Set by a private option. */ +}; + +struct buff_data { + struct video_data *s; + int index; +}; + +struct fmt_map { + enum AVPixelFormat ff_fmt; + enum AVCodecID codec_id; + uint32_t v4l2_fmt; +}; + +static struct fmt_map fmt_conversion_table[] = { + //ff_fmt codec_id v4l2_fmt + { AV_PIX_FMT_YUV420P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YUV420 }, + { AV_PIX_FMT_YUV420P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YVU420 }, + { 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_YUV410P, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_YVU410 }, + { AV_PIX_FMT_RGB555LE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555 }, + { AV_PIX_FMT_RGB555BE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB555X }, + { AV_PIX_FMT_RGB565LE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565 }, + { AV_PIX_FMT_RGB565BE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB565X }, + { 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_BGR0, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_BGR32 }, + { AV_PIX_FMT_0RGB, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_RGB32 }, + { AV_PIX_FMT_GRAY8, AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_GREY }, +#ifdef V4L2_PIX_FMT_Y16 + { AV_PIX_FMT_GRAY16LE,AV_CODEC_ID_RAWVIDEO, V4L2_PIX_FMT_Y16 }, +#endif + { 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 +#ifdef V4L2_PIX_FMT_CPIA1 + { AV_PIX_FMT_NONE, AV_CODEC_ID_CPIA, V4L2_PIX_FMT_CPIA1 }, +#endif +}; + +static int device_open(AVFormatContext *ctx) +{ + struct v4l2_capability cap; + int fd; + int ret; + int flags = O_RDWR; + + if (ctx->flags & AVFMT_FLAG_NONBLOCK) { + flags |= O_NONBLOCK; + } + + fd = v4l2_open(ctx->filename, flags, 0); + if (fd < 0) { + ret = AVERROR(errno); + av_log(ctx, AV_LOG_ERROR, "Cannot open video device %s: %s\n", + ctx->filename, av_err2str(ret)); + return ret; + } + + if (v4l2_ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0) { + ret = AVERROR(errno); + av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYCAP): %s\n", + av_err2str(ret)); + goto fail; + } + + av_log(ctx, AV_LOG_VERBOSE, "fd:%d capabilities:%x\n", + fd, cap.capabilities); + + if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) { + av_log(ctx, AV_LOG_ERROR, "Not a video capture device.\n"); + ret = AVERROR(ENODEV); + goto fail; + } + + if (!(cap.capabilities & V4L2_CAP_STREAMING)) { + av_log(ctx, AV_LOG_ERROR, + "The device does not support the streaming I/O method.\n"); + ret = AVERROR(ENOSYS); + goto fail; + } + + return fd; + +fail: + v4l2_close(fd); + return ret; +} + +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 = { .type = V4L2_BUF_TYPE_VIDEO_CAPTURE }; + struct v4l2_pix_format *pix = &fmt.fmt.pix; + + int res = 0; + + pix->width = *width; + pix->height = *height; + pix->pixelformat = pix_fmt; + pix->field = V4L2_FIELD_ANY; + + if (v4l2_ioctl(fd, VIDIOC_S_FMT, &fmt) < 0) + res = AVERROR(errno); + + 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); + *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); + res = AVERROR(EINVAL); + } + + if (fmt.fmt.pix.field == V4L2_FIELD_INTERLACED) { + av_log(ctx, AV_LOG_DEBUG, + "The V4L2 driver is using the interlaced mode\n"); + s->interlaced = 1; + } + + return res; +} + +static int first_field(int fd) +{ + int res; + v4l2_std_id std; + + res = v4l2_ioctl(fd, VIDIOC_G_STD, &std); + if (res < 0) { + return 0; + } + if (std & V4L2_STD_NTSC) { + return 0; + } + + return 1; +} + +static uint32_t fmt_ff2v4l(enum AVPixelFormat pix_fmt, enum AVCodecID codec_id) +{ + int i; + + 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; + } + } + + return 0; +} + +static enum AVPixelFormat fmt_v4l2ff(uint32_t v4l2_fmt, enum AVCodecID codec_id) +{ + int i; + + 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 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, "Raw : %9s : %20s :", + fmt_name ? fmt_name : "Unsupported", + vfd.description); + } else if (vfd.flags & V4L2_FMT_FLAG_COMPRESSED && + type & V4L_COMPFORMATS) { + AVCodec *codec = avcodec_find_decoder(codec_id); + av_log(ctx, AV_LOG_INFO, "Compressed: %9s : %20s :", + codec ? codec->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 void list_standards(AVFormatContext *ctx) +{ + int ret; + struct video_data *s = ctx->priv_data; + struct v4l2_standard standard; + + if (s->std_id == 0) + return; + + for (standard.index = 0; ; standard.index++) { + if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) { + ret = AVERROR(errno); + if (ret == AVERROR(EINVAL)) { + break; + } else { + av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret)); + return; + } + } + av_log(ctx, AV_LOG_INFO, "%2d, %16llx, %s\n", + standard.index, standard.id, standard.name); + } +} + +static int mmap_init(AVFormatContext *ctx) +{ + 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 + }; + + if (v4l2_ioctl(s->fd, VIDIOC_REQBUFS, &req) < 0) { + res = AVERROR(errno); + av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_REQBUFS): %s\n", av_err2str(res)); + return res; + } + + if (req.count < 2) { + av_log(ctx, AV_LOG_ERROR, "Insufficient buffer memory\n"); + return AVERROR(ENOMEM); + } + s->buffers = req.count; + s->buf_start = av_malloc(sizeof(void *) * s->buffers); + if (s->buf_start == NULL) { + av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer pointers\n"); + return AVERROR(ENOMEM); + } + s->buf_len = av_malloc(sizeof(unsigned int) * s->buffers); + if (s->buf_len == NULL) { + av_log(ctx, AV_LOG_ERROR, "Cannot allocate buffer sizes\n"); + av_free(s->buf_start); + return AVERROR(ENOMEM); + } + + for (i = 0; i < req.count; i++) { + struct v4l2_buffer buf = { + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, + .index = i, + .memory = V4L2_MEMORY_MMAP + }; + if (v4l2_ioctl(s->fd, VIDIOC_QUERYBUF, &buf) < 0) { + res = AVERROR(errno); + av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QUERYBUF): %s\n", av_err2str(res)); + return res; + } + + s->buf_len[i] = buf.length; + if (s->frame_size > 0 && s->buf_len[i] < s->frame_size) { + av_log(ctx, AV_LOG_ERROR, + "buf_len[%d] = %d < expected frame size %d\n", + i, s->buf_len[i], s->frame_size); + return AVERROR(ENOMEM); + } + s->buf_start[i] = v4l2_mmap(NULL, buf.length, + PROT_READ | PROT_WRITE, MAP_SHARED, + s->fd, buf.m.offset); + + if (s->buf_start[i] == MAP_FAILED) { + res = AVERROR(errno); + av_log(ctx, AV_LOG_ERROR, "mmap: %s\n", av_err2str(res)); + return res; + } + } + + return 0; +} + +#if FF_API_DESTRUCT_PACKET +static void dummy_release_buffer(AVPacket *pkt) +{ + av_assert0(0); +} +#endif + +static void mmap_release_buffer(void *opaque, uint8_t *data) +{ + struct v4l2_buffer buf = { 0 }; + int res; + struct buff_data *buf_descriptor = opaque; + struct video_data *s = buf_descriptor->s; + + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + buf.memory = V4L2_MEMORY_MMAP; + buf.index = buf_descriptor->index; + av_free(buf_descriptor); + + if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) { + res = AVERROR(errno); + av_log(NULL, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", + av_err2str(res)); + } + + avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1); +} + +#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) +static int64_t av_gettime_monotonic(void) +{ + struct timespec tv; + + clock_gettime(CLOCK_MONOTONIC, &tv); + return (int64_t)tv.tv_sec * 1000000 + tv.tv_nsec / 1000; +} +#endif + +static int init_convert_timestamp(AVFormatContext *ctx, int64_t ts) +{ + struct video_data *s = ctx->priv_data; + int64_t now; + + now = av_gettime(); + if (s->ts_mode == V4L_TS_ABS && + ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE) { + av_log(ctx, AV_LOG_INFO, "Detected absolute timestamps\n"); + s->ts_mode = V4L_TS_CONVERT_READY; + return 0; + } +#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) + now = av_gettime_monotonic(); + if (s->ts_mode == V4L_TS_MONO2ABS || + (ts <= now + 1 * AV_TIME_BASE && ts >= now - 10 * AV_TIME_BASE)) { + AVRational tb = {AV_TIME_BASE, 1}; + int64_t period = av_rescale_q(1, tb, ctx->streams[0]->avg_frame_rate); + av_log(ctx, AV_LOG_INFO, "Detected monotonic timestamps, converting\n"); + /* microseconds instead of seconds, MHz instead of Hz */ + s->timefilter = ff_timefilter_new(1, period, 1.0E-6); + s->ts_mode = V4L_TS_CONVERT_READY; + return 0; + } +#endif + av_log(ctx, AV_LOG_ERROR, "Unknown timestamps\n"); + return AVERROR(EIO); +} + +static int convert_timestamp(AVFormatContext *ctx, int64_t *ts) +{ + struct video_data *s = ctx->priv_data; + + if (s->ts_mode) { + int r = init_convert_timestamp(ctx, *ts); + if (r < 0) + return r; + } +#if HAVE_CLOCK_GETTIME && defined(CLOCK_MONOTONIC) + if (s->timefilter) { + int64_t nowa = av_gettime(); + int64_t nowm = av_gettime_monotonic(); + ff_timefilter_update(s->timefilter, nowa, nowm - s->last_time_m); + s->last_time_m = nowm; + *ts = ff_timefilter_eval(s->timefilter, *ts - nowm); + } +#endif + return 0; +} + +static int mmap_read_frame(AVFormatContext *ctx, AVPacket *pkt) +{ + struct video_data *s = ctx->priv_data; + struct v4l2_buffer buf = { + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, + .memory = V4L2_MEMORY_MMAP + }; + int res; + + /* FIXME: Some special treatment might be needed in case of loss of signal... */ + while ((res = v4l2_ioctl(s->fd, VIDIOC_DQBUF, &buf)) < 0 && (errno == EINTR)); + if (res < 0) { + if (errno == EAGAIN) { + pkt->size = 0; + return AVERROR(EAGAIN); + } + res = AVERROR(errno); + av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_DQBUF): %s\n", av_err2str(res)); + return res; + } + + if (buf.index >= s->buffers) { + av_log(ctx, AV_LOG_ERROR, "Invalid buffer index received.\n"); + return AVERROR(EINVAL); + } + 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); + + /* CPIA is a compressed format and we don't know the exact number of bytes + * used by a frame, so set it here as the driver announces it. + */ + if (ctx->video_codec_id == AV_CODEC_ID_CPIA) + s->frame_size = buf.bytesused; + + 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] */ + if (avpriv_atomic_int_get(&s->buffers_queued) == FFMAX(s->buffers / 8, 1)) { + /* when we start getting low on queued buffers, fallback to copying data */ + res = av_new_packet(pkt, buf.bytesused); + if (res < 0) { + av_log(ctx, AV_LOG_ERROR, "Error allocating a packet.\n"); + if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) == 0) + avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1); + return res; + } + memcpy(pkt->data, s->buf_start[buf.index], buf.bytesused); + + if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) { + res = AVERROR(errno); + av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res)); + 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 + pkt->destruct = dummy_release_buffer; +#endif + + 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 memcpying into it + */ + av_log(ctx, AV_LOG_ERROR, "Failed to allocate a buffer descriptor\n"); + if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) == 0) + avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1); + + return AVERROR(ENOMEM); + } + 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_log(ctx, AV_LOG_ERROR, "Failed to create a buffer\n"); + if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) == 0) + avpriv_atomic_int_add_and_fetch(&s->buffers_queued, 1); + av_freep(&buf_descriptor); + return AVERROR(ENOMEM); + } + } + pkt->pts = buf.timestamp.tv_sec * INT64_C(1000000) + buf.timestamp.tv_usec; + convert_timestamp(ctx, &pkt->pts); + + return s->buf_len[buf.index]; +} + +static int mmap_start(AVFormatContext *ctx) +{ + struct video_data *s = ctx->priv_data; + enum v4l2_buf_type type; + int i, res; + + for (i = 0; i < s->buffers; i++) { + struct v4l2_buffer buf = { + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, + .index = i, + .memory = V4L2_MEMORY_MMAP + }; + + if (v4l2_ioctl(s->fd, VIDIOC_QBUF, &buf) < 0) { + res = AVERROR(errno); + av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_QBUF): %s\n", av_err2str(res)); + return res; + } + } + s->buffers_queued = s->buffers; + + type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + if (v4l2_ioctl(s->fd, VIDIOC_STREAMON, &type) < 0) { + res = AVERROR(errno); + av_log(ctx, AV_LOG_ERROR, "ioctl(VIDIOC_STREAMON): %s\n", av_err2str(res)); + return res; + } + + return 0; +} + +static void mmap_close(struct video_data *s) +{ + enum v4l2_buf_type type; + int i; + + type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + /* We do not check for the result, because we could + * not do anything about it anyway... + */ + v4l2_ioctl(s->fd, VIDIOC_STREAMOFF, &type); + for (i = 0; i < s->buffers; i++) { + v4l2_munmap(s->buf_start[i], s->buf_len[i]); + } + av_free(s->buf_start); + av_free(s->buf_len); +} + +static int v4l2_set_parameters(AVFormatContext *s1) +{ + struct video_data *s = s1->priv_data; + struct v4l2_standard standard = { 0 }; + struct v4l2_streamparm streamparm = { 0 }; + struct v4l2_fract *tpf; + AVRational framerate_q = { 0 }; + int i, ret; + + 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; + } + + if (s->standard) { + if (s->std_id) { + ret = 0; + av_log(s1, AV_LOG_DEBUG, "Setting standard: %s\n", s->standard); + /* set tv standard */ + for (i = 0; ; i++) { + standard.index = i; + if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) { + ret = AVERROR(errno); + break; + } + if (!av_strcasecmp(standard.name, s->standard)) + break; + } + if (ret < 0) { + av_log(s1, AV_LOG_ERROR, "Unknown or unsupported standard '%s'\n", s->standard); + return ret; + } + + if (v4l2_ioctl(s->fd, VIDIOC_S_STD, &standard.id) < 0) { + ret = AVERROR(errno); + av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_STD): %s\n", av_err2str(ret)); + return ret; + } + } else { + av_log(s1, AV_LOG_WARNING, + "This device does not support any standard\n"); + } + } + + /* get standard */ + if (v4l2_ioctl(s->fd, VIDIOC_G_STD, &s->std_id) == 0) { + tpf = &standard.frameperiod; + for (i = 0; ; i++) { + standard.index = i; + if (v4l2_ioctl(s->fd, VIDIOC_ENUMSTD, &standard) < 0) { + ret = AVERROR(errno); + av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMSTD): %s\n", av_err2str(ret)); + return ret; + } + if (standard.id == s->std_id) { + av_log(s1, AV_LOG_DEBUG, + "Current standard: %s, id: %"PRIu64", frameperiod: %d/%d\n", + standard.name, (uint64_t)standard.id, tpf->numerator, tpf->denominator); + break; + } + } + } else { + tpf = &streamparm.parm.capture.timeperframe; + } + + streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + if (v4l2_ioctl(s->fd, VIDIOC_G_PARM, &streamparm) < 0) { + ret = AVERROR(errno); + av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_PARM): %s\n", av_err2str(ret)); + return ret; + } + + if (framerate_q.num && framerate_q.den) { + if (streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) { + tpf = &streamparm.parm.capture.timeperframe; + + 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 (v4l2_ioctl(s->fd, VIDIOC_S_PARM, &streamparm) < 0) { + ret = AVERROR(errno); + av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_PARM): %s\n", av_err2str(ret)); + return ret; + } + + 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 { + av_log(s1, AV_LOG_WARNING, + "The driver does not allow to change time per frame\n"); + } + } + s1->streams[0]->avg_frame_rate.num = tpf->denominator; + s1->streams[0]->avg_frame_rate.den = tpf->numerator; + s1->streams[0]->r_frame_rate = s1->streams[0]->avg_frame_rate; + + return 0; +} + +static int device_try_init(AVFormatContext *s1, + enum AVPixelFormat pix_fmt, + int *width, + int *height, + uint32_t *desired_format, + enum AVCodecID *codec_id) +{ + int ret, i; + + *desired_format = fmt_ff2v4l(pix_fmt, s1->video_codec_id); + + if (*desired_format) { + ret = device_init(s1, width, height, *desired_format); + if (ret < 0) { + *desired_format = 0; + if (ret != AVERROR(EINVAL)) + return ret; + } + } + + if (!*desired_format) { + for (i = 0; i<FF_ARRAY_ELEMS(fmt_conversion_table); i++) { + if (s1->video_codec_id == AV_CODEC_ID_NONE || + fmt_conversion_table[i].codec_id == s1->video_codec_id) { + av_log(s1, AV_LOG_DEBUG, "Trying to set codec:%s pix_fmt:%s\n", + avcodec_get_name(fmt_conversion_table[i].codec_id), + (char *)av_x_if_null(av_get_pix_fmt_name(fmt_conversion_table[i].ff_fmt), "none")); + + *desired_format = fmt_conversion_table[i].v4l2_fmt; + ret = device_init(s1, width, height, *desired_format); + if (ret >= 0) + break; + else if (ret != AVERROR(EINVAL)) + return ret; + *desired_format = 0; + } + } + + if (*desired_format == 0) { + av_log(s1, AV_LOG_ERROR, "Cannot find a proper format for " + "codec '%s' (id %d), pixel format '%s' (id %d)\n", + avcodec_get_name(s1->video_codec_id), s1->video_codec_id, + (char *)av_x_if_null(av_get_pix_fmt_name(pix_fmt), "none"), pix_fmt); + ret = AVERROR(EINVAL); + } + } + + *codec_id = fmt_v4l2codec(*desired_format); + av_assert0(*codec_id != AV_CODEC_ID_NONE); + return ret; +} + +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 = AV_CODEC_ID_NONE; + enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE; + struct v4l2_input input = { 0 }; + + st = avformat_new_stream(s1, NULL); + if (!st) + return AVERROR(ENOMEM); + +#if CONFIG_LIBV4L2 + /* silence libv4l2 logging. if fopen() fails v4l2_log_file will be NULL + and errors will get sent to stderr */ + v4l2_log_file = fopen("/dev/null", "w"); +#endif + + s->fd = device_open(s1); + if (s->fd < 0) + return s->fd; + + /* set tv video input */ + av_log(s1, AV_LOG_DEBUG, "Selecting input_channel: %d\n", s->channel); + if (v4l2_ioctl(s->fd, VIDIOC_S_INPUT, &s->channel) < 0) { + res = AVERROR(errno); + av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_INPUT): %s\n", av_err2str(res)); + return res; + } + + input.index = s->channel; + if (v4l2_ioctl(s->fd, VIDIOC_ENUMINPUT, &input) < 0) { + res = AVERROR(errno); + av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_ENUMINPUT): %s\n", av_err2str(res)); + return res; + } + s->std_id = input.std; + av_log(s1, AV_LOG_DEBUG, "input_channel: %d, input_name: %s\n", + s->channel, input.name); + + if (s->list_format) { + list_formats(s1, s->fd, s->list_format); + return AVERROR_EXIT; + } + + if (s->list_standard) { + list_standards(s1); + return AVERROR_EXIT; + } + + avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */ + + if (s->pixel_format) { + AVCodec *codec = avcodec_find_decoder_by_name(s->pixel_format); + + if (codec) + s1->video_codec_id = codec->id; + + 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); + } + } + + if (!s->width && !s->height) { + struct v4l2_format fmt; + + av_log(s1, AV_LOG_VERBOSE, + "Querying the device for the current frame size\n"); + fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + if (v4l2_ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) { + res = AVERROR(errno); + av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res)); + 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); + } + + res = device_try_init(s1, pix_fmt, &s->width, &s->height, &desired_format, &codec_id); + if (res < 0) { + v4l2_close(s->fd); + return res; + } + + /* If no pixel_format was specified, the codec_id was not known up + * until now. Set video_codec_id in the context, as codec_id will + * not be available outside this function + */ + if (codec_id != AV_CODEC_ID_NONE && s1->video_codec_id == AV_CODEC_ID_NONE) + s1->video_codec_id = codec_id; + + if ((res = av_image_check_size(s->width, s->height, 0, s1)) < 0) + return res; + + s->frame_format = desired_format; + + if ((res = v4l2_set_parameters(s1)) < 0) + return res; + + st->codec->pix_fmt = fmt_v4l2ff(desired_format, codec_id); + s->frame_size = + avpicture_get_size(st->codec->pix_fmt, s->width, s->height); + + if ((res = mmap_init(s1)) || + (res = mmap_start(s1)) < 0) { + v4l2_close(s->fd); + return res; + } + + s->top_field_first = first_field(s->fd); + + 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); + if (desired_format == V4L2_PIX_FMT_YVU420) + st->codec->codec_tag = MKTAG('Y', 'V', '1', '2'); + else if (desired_format == V4L2_PIX_FMT_YVU410) + st->codec->codec_tag = MKTAG('Y', 'V', 'U', '9'); + 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; +} + +static int v4l2_read_packet(AVFormatContext *s1, AVPacket *pkt) +{ + struct video_data *s = s1->priv_data; + AVFrame *frame = s1->streams[0]->codec->coded_frame; + int res; + + av_init_packet(pkt); + if ((res = mmap_read_frame(s1, pkt)) < 0) { + return res; + } + + if (frame && s->interlaced) { + frame->interlaced_frame = 1; + frame->top_field_first = s->top_field_first; + } + + return pkt->size; +} + +static int v4l2_read_close(AVFormatContext *s1) +{ + struct video_data *s = s1->priv_data; + + 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); + + v4l2_close(s->fd); + return 0; +} + +#define OFFSET(x) offsetof(struct video_data, x) +#define DEC AV_OPT_FLAG_DECODING_PARAM + +static const AVOption options[] = { + { "standard", "set TV standard, used only by analog frame grabber", OFFSET(standard), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, DEC }, + { "channel", "set TV channel, used only by frame grabber", OFFSET(channel), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, DEC }, + { "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC }, + { "pixel_format", "set preferred pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, + { "input_format", "set preferred pixel format (for raw video) or codec name", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC }, + { "framerate", "set frame rate", 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" }, + + { "list_standards", "list supported standards and exit", OFFSET(list_standard), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, DEC, "list_standards" }, + { "all", "show all supported standards", OFFSET(list_standard), AV_OPT_TYPE_CONST, {.i64 = 1 }, 0, 0, DEC, "list_standards" }, + + { "timestamps", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "timestamps" }, + { "ts", "set type of timestamps for grabbed frames", OFFSET(ts_mode), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 2, DEC, "timestamps" }, + { "default", "use timestamps from the kernel", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_DEFAULT }, 0, 2, DEC, "timestamps" }, + { "abs", "use absolute timestamps (wall clock)", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_ABS }, 0, 2, DEC, "timestamps" }, + { "mono2abs", "force conversion from monotonic to absolute timestamps", OFFSET(ts_mode), AV_OPT_TYPE_CONST, {.i64 = V4L_TS_MONO2ABS }, 0, 2, DEC, "timestamps" }, + + { 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,v4l2", + .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, +}; |